Avengers: The Initiative: Henry Gyrich, all the way. When a student at a superhero training camp is killed in a training exercise, one he oversaw, Gyrich buries all knowledge of it, has the student dissected in order to work out how he got his superpowers (which he didn't actually have), and has the kid cloned repeatedly, eventually resulting in one going utterly psychotic, rampaging about the base, killing several people and graphically wounding several others. Gyrich's response? It's not his fault, and he doesn't deserve to be dragged over the coals for it. Iron Mandisagrees, and has him fired.
Avengers vs. X-Men: Captain America first chooses to consult a man who was already in conflict with Cyclops, then ignoring the fact that the Phoenix was almost always under control during Jean Grey's possession, and completely under control with Rachel Summers's possession. He goes to Utopia, a sovereign nation, and he tells their leader to give up his granddaughter and brings an army to the fight. When asked to leave, he refuses. He then leads in pushing and poking the Phoenix-empowered X-Men even though they were only improving the world, which Reed Richards points out (although whether or not they're improving the world for the right reasons or just wanking off at themselves and their newfound power while putting all their oppressors under house arrest is debatable). He refuses to take responsibility for provoking the war and blames Cyclops.
Much later... Captain America and Professor Xavier get the X-Men and the Avengers together to gang up on Cyclops and Emma. While the X-Men and the Avengers attack him physically, Xavier tries to mindwipe him. Cyclops begs him to stop, but he doesn't, so Cyclops channeling the power of the Phoenix Force, kills Professor Xavier in a fit of rage when Xavier tries to mindwipe him again. Cyclops breaks down crying... and blames Captain America for making him do it.
In the end, Cap subverts this by accepting some responsibility for the whole mess. Cap resolves to be more supportive of mutants in general and officially endorses the X-Men, and goes so far as to make a team that would pair Avengers up with the X-Men and other mutants, while Cyclops is wracked by guilt for killing Xavier.
Baron Zemo has gotten the idea into his head that the only reason he isn't able to help the world by ruling it is because those selfish, mean superheroes just won't give him a chance. He's tried to switch sides before and expects total forgiveness/trust despite a.) acting like a mentally unstable sociopath even on his best days and b.) pretending to be a hero once as part of an Evil Plan. He's been known to wear his costume and continue using his supervillain name during trials for his crimes, and yet when he's found guilty it's the system discriminating against him. This was largely caused by his father beating praise into him through his childhood; by the time he was an adult, he was completely convinced of his inherent superiority over others. Thus, in his mind, he can do no wrong. Because of this, Zemo is constantly struggling with his morality.
Left-Winger and Right-Winger expose John Walker's identity on national television out of spite, and are surprised when, after John's parents are killed by his enemies, he blames them for this. Likewise, their manager, the man who put them up to it, blames John for not being able to protect his parents in the first place.
Fantastic Four: The basis of Doctor Doom's vendetta against the Fantastic Four is that he is unable to accept that Reed Richards was actually right when warning him of a critical error in his calculations during an experiment Doom was conducting. Doom dismissed Reed's warnings as jealousy, only for the experiment to blow up in his face. The idea that Richards was correct - and therefore, in Doom's eyes, smarter than him - was so abhorrent to Doom that he concluded that Reed had deliberately sabotaged his experiment, and so has attempted to creatively kill Richards and his family on numerous occasions. Even more jarring is that the retcon shows that Doom really was right and Richards was indeed wrong: the machine worked perfectly. It blew up because Doom used it to take a peek into Hell. With Doom it's more "Always Reed Richards' Fault".
The one-shot book The Fantastic Four Roast alters this for a laugh. Dr. Doom blames Reed for what he became because he wasn't invited to go on a panty raid with Reed and his college buddies.
FF #5 reveals that the accident was apparently Ben's fault, as he tampered with the equipment to show Doom up for picking on his friend. Issue #9 puts the kibosh on that and reveals that alternate universe/timeline Dooms from the future made sure it would happen, and past Doom went along with it after seeing how powerful he would become in the future. So the accident was all Doom's fault.
The epilogue of the Heart of the Monster arc in The Incredible Hulks has Bruce realize that one of the reasons the various Hulk personas exist is to shift blame to one another. For example, Hulk blames Bruce for being too weak to save their mother from their abusive father, as well as the numerous times he's screwed things up with science. Bruce blames the Hulk for acting out Banner's most destructive thoughts and feelings (especially since each Hulk acts out different feelings). Thanks to these transformations, all of them can continue shifting blame to one another rather than accept that they're all the same person and thus the failings are shared amongst them all.
Brian Banner was all over this one. His horrific abuse of his wife and son is his dad's fault, for being abusive, or little Bruce's fault for being born super-smart. His eventual murder of his wife? Bruce's fault, for being born at all. Even in Immortal Hulk, when he's been dragged down to Hell itself for his actions, twice, he still refuses to acknowledge that the situation might possibly in any way be his own fault.
General Reginald Fortean, through Immortal Hulk. He constantly shifts any responsibility for his actions onto other people, when he's the one forcing them to do those things, especially when anyone tries calling him out on his deeds.
Spider-Man: Peter Parker is well known for holding responsibility as the core of his values. Fittingly, many of his enemies are defined by their complete refusal to take responsibility for themselves.
One of the best-known examples is Eddie Brock, who blames Spider-Man for destroying his journalistic career in both the 616 and Maguire/Raimi movie continuities, when in both cases, all Peter did was expose Brock's lack of ethics. In 616, Brock said he knew who the serial killer known as the Sin-Eater was, only for Spidey to bring in the real crook while Eddie's guy turned out to be a serial confessor. In the film, Peter busts him for selling photoshopped pictures to the Daily Bugle.
One of the rationalizations Eddie gives to make himself look like the victim is that the real killer, Stan Carter, would have stopped his killings, knowing that he could get off scot-free. Leaving aside the issues with letting someone get away with murder, Brock's argument is easily disproven by the fact that Carter did not stop his killings after Gregg was arrested; Spider-Man and Daredevil caught him trying to murder Betty Brant at the Daily Bugle office after realizing Gregg was not the killer. Even if the heroes hadn't discovered Gregg was lying, the truth would still have come out and Brock would have probably faced even worse blowback since his mistake would have cost someone her life.
Ironically, it was later revealed that Gregg had been the original Sin-Eater and Carter was a copycat who wound up proving more dangerous than the original. So Eddie was right, and had been unfairly raked over the coals for it, although it was still a case of Misplaced Retribution.
Peter Parker's boss J. Jonah Jameson is guilty of this from time to time as well. His irresponsible journalism often puts people's lives at risk, but he always blames Spider-Man for causing the problems. Subverted in Amazing Spider-Man#654where Alistair Smythe kills Jameson's wife, Marla (who took the hit that was meant for him). He even says that he's not going to blame Spider-Man, instead saying that "It's All My Fault."
Also in Ultimate Spider-Man, after Peter gets his powers, he finally stands up to Jerk Jock Flash Thompson. They get in a fight, which Peter tries to talk Flash out of, while the creep keeps throwing punches at him. Finally, Peter catches Flash's hand and breaks it by accident. Flash goes crying to his mommy and daddy who sue Aunt May and Uncle Ben for the medical bills.
Another example in Ultimate Spider-Man would be Norman Osborn, who blames everyone but himself for his own crimes and the horrible things he's done both to his own body and to his son. In particular, he seems convinced that Nick Fury is behind everything bad that ever happens to him, motivated out of jealousy, when in reality Fury barely acknowledges Osborn's existence.
In the prime (Earth-616) universe, Osborn generally does this to a lesser extent; while he doesn't blame Spider-Man for everything wrong in his life, he does deflect responsibility for his poor relationship with his son onto other people rather than just accept that he's a bad father.
It gets taken to ridiculous extremes in Friendly Neighborhood Spider Man Vol. 1 #5. There was a girl, Vanna Smith, who kept being in the wrong place at the wrong time and having to deal with an insane crisis with Spider-Man in some manner. This happens for years because Peter just happened to go to the same school as the woman, eventually reaching the point where she gets a restraining order against him. Because of this, she shut herself in and became an extreme recluse, thinking Spider-Man was stalking her and blaming him for ruining her life. Never mind that he was saving the day, it was his fault that her life was so miserable. She reports this to the Daily Bugle where Peter Parker, of all people, took her picture for her story after she got the restraining order. Decades later, with Spider-Man long dead, the now elderly woman is still a recluse, who has no friends, never married or had any children, and is still living in her late parent’s house. When an angry Mary Jane called her out on slandering Spider-Man after his death, Vanna admitted that the real reason she did that was because it made her feel special. Deep down, she actually liked the idea of a superhero being interested in her. Without Spider-Man, her life is now completely empty.
After his parents die, Nuke blames Tom Thumb for their deaths. Though it's obvious that Nuke's power killed them, he blames Tom for not finding a cure for cancer in time.
Golden Archer gets kicked off the team for using the B-Mod to brainwash the Lark into being his girlfriend. When he resurfaces as the Black Archer, he's determined to make up for this... but then in the same sentence blames the Squadron for inventing the device in the first place.
Sub-Mariner: Almost every time Namor the Sub-Mariner ever appears outside his own comic book and sometimes in it he acts like a completely psychotic Jerkass to everybody he meets for reasons that usually amount to Insane Troll Logic and/or Blue-and-Orange Morality then blames the various heroes that are trying to stop his destructive acts and/or humanity as a whole for the fact that he's doing this and the pain he's going to inflict on them for getting in his way. For instance, he has kidnapped or tried to kidnap Sue Storm multiple times but blames the Fantastic Four for trying to rescue her and bring him in.
Ultimate Fantastic Four: Doctor Victor van Damme, in this continuity, interfered with Reed Richards' prototype teleporter. The resultant energies resulted in the creation of the Ultimate Fantastic Four, and his own transformation into a demonic-looking being of living metal. Doctor Doom insists that the transformation is not his fault, but rather that Reed's calculations were "so bad even [he] couldn't fix them". The fact Reed lays the blame for the transformation squarely on van Damme is supposed to show that they're not so different, but it kind of falls flat when we see that, in an Alternate Universe where van Damme kept his grubby fingers to himself, nobody was transformed. That universe also resulted in humanity being wiped out by the Skrulls when they appeared as benefactors and gave everyone superpowers... with deliberately rigged technology that allowed the Skrulls to kill them all when they were ready to conquer Earth... but what's that saying about omelets and eggs?
The Ultimates: Henry Pym committed Domestic Abuse against the Wasp for years. Some time later, when he tries to apologize for nearly killing her, he does so in the most passive-aggressive fashion possible. She quickly hangs up on him.
Flash Thompson in "What if Flash Thompson became Spider-Man?" 2018 one-shot. Despite being a hero, he's also a major Jerkass who has frightened the populace. He accuses Peter Parker of trying to slander him through his photos and ends up murdering him.
In What If Dark Spider Gwen, after Harry Osborn shoots the Green Goblin and only learns the villain was his father afterwards, he then blames Gwen Stacy for "making" him shoot the Goblin, when Gwen just chose to spare the villain despite how he killed Spider-Man/Peter Parker and it was purely Harry's choice to pull the trigger.
X-Men: Despite Magneto's desire to help his fellow mutants and deliver them from persecution, his actions have probably done more to hurt his cause (and harmed more mutants) than help. Naturally, this is always humanity's fault. How far this goes, or if it applies at all, depends a lot on who is writing him. Most of the time, he sees that he is culpable for what he did and is ready to do, but he feels he has to do what is necessary, not what is morally right. Chris Claremont brought this out in Uncanny X-Men #275, where he says, "My people are in danger [...] and a kinder, gentler Magneto cannot save them", and where there is also this telling exchange with Colonel Semyanov, who betrayed him, Rogue, and the forces of S.H.I.E.L.D. to the Big Bad, Zaladane, in order to get revenge on Magneto for killing his son 125 issues earlier:
Magneto: I am sorry for your son, Colonel. Which is more than I ever heard... for the slaughter of those I loved. Semyanov: Your... daughter, you mean? And that absolves you of any crime? Magneto: I never said it did. For who we are, and what we have done, comrade Colonel... we are both of us condemned. [kills him]
