Why does Mr. White not flee when Bond spooks the Quantum members during the opera scene? He's recovering from a gunshot wound to the leg and wouldn't be able to get far if he tried!
Perhaps more importantly, he knows Bond (and MI6) already knows who he is. There's no point trying to run to hide his affiliation.
An additional factor: the movers and shakers of Quantum appear to be rich, powerful, and influential members of society. In other words, when it comes to espionage, spying, and tradecraft, amateurs. White is an experienced, professional spook and so doesn't panic where the others do and stays where he is. Bond merely pokes the nest by interrupting their private discussion, and their collective first instinct is to flee in the middle of an ongoing opera. This allows Bond to immediately home in on the only people leaving the theater during the performance all at the same time, as opposed to them at least waiting until the show is over and hiding in the audience leaving the show.
Craig was frequently criticized for his cold, emotionless performance, with one reviewer calling him a "Robo Bond." However, at the end of Casino Royale (2006), which this film immediately follows, Bond's reaction to Vesper's death was... to completely shut down emotionally. Bond begins the film in the midst of a Heroic BSoD, and doesn't pull out of it again until the last few minutes of the film.
Plenty of criticism was raised about a scene taking place during a performance of Puccini's opera Tosca. The story of Tosca? A beautiful and successful singer is given a choice; betray her political beliefs and sleep with the evil chief of police... or her lover will be executed. It's basically mirrors what happened to Vesper. Also, the major song that plays during that scene is called the Te Deum where the villain is plotting to execute Tosca's lover even if she gives in. Like our villains, it's in a public place (a Cathedral in the opera whereas Quantum of Solace is in an opera house). Now it makes sense.
Bond and Camille not sleeping together is for once, a nice bit of change in a Bond film—they're both too damaged from what they've been through to attempt anything. Even if they were in better shape psychologically, they're relentlessly pursued during the film, with practically the only downtime they have being after they jumped from the plane and end up in a sinkhole.
