As a documentary cameraman, the situation is actually the reverse.
In order to get E&O Insurance (protecting the producers against lawsuits for libel, etc.) a documentary filmmaker has to get signed release forms from everyone who appears in the documentary, AND signed release forms from any company whose logo appears in the film - because the insurance company wants to decrease their risk of having to deal with a lawsuit to zero.
Many channels will not broadcast a program that doesn't have E&O Insurance, although news divisions are generally exempt - so a "60 Minutes" documentary doesn't have to blur trademarks, while an independently-produced documentary does.
There is really no legal requirement for this - it's just insurance companies reducing their risk. Production companies who have the nerve to go without E&O Insurance can include logos as long as they are comfortable assuming the risk of being sued by the companies whose products are involved.
Documentary and logos
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