Pretty much, R82, but I'd phrase it as, you get a free pass if you have power (as measured in money, influence, career success, whatever).
Hollywood and the PR / marketing machine that supports it are designed to prop up stars who have the proven ability to make money for themselves and everyone else in the projects they're involved in. Each star helps support an ecosystem of studios, producers, crew members, assistants, PR flacks, etc. - if that ecosystem is threatened, it will try to protect itself, in part by burying bad press and giving stars a "pass", so long as they can still generate money for everyone else. If the star's influence is weak or fading, they're thrown under the bus.
This applies regardless of race (though it probably correlates with minority actors having less power and influence in general). Will Smith generally gets a pass on things like his Scientology because until recently, he was a reliable hit-maker at the global box office. Compare how people treat his Scientology to Tom Cruise's.
Sandra Bullock? Around the time of the "scandal" (if you can call it that), she was in the prime of her hot streak (with the Blind Side, the Proposal, etc.) So she was treated as a sympathetic unknowing victim.
Angelina and Brad were already established stars and coming off the success of Mr. and Mrs. Smith when their affair broke, and while I'd disagree they got off with a "pass", I think everyone in the Hollywood eco-system realized the value in drawing out the drama and presenting their version of events.
Alec Baldwin is still coming off the late career resurgence he had with 30 Rock, and he has friends willing to speak on his behalf. If he were a has-been, he'd be toast (just like Mel Gibson).
Compare them to cases like Mel Gibson or Meg Ryan, who was already losing her looks and box office appeal when her affair with Russell Crowe happened. If the movie they were in had actually been a box office hit, they'd have gotten less flak, and the story would've been buried.