I can understand why Angelina is so reviled, although I may not agree with the reactions against her.
It's hard not to feel sorry for Jen, even I, that infinitely preferred Angelina as a celebrity(before the kids and the charities) and thought Jen was just insipid, could not help "being on her side". She was fantastically humiliated by her husband in front of the world stage, it's like every married women 's nightmare. I think the difference in this case is that everyone felt, that it was a total uneven match, that she simply had no chance from the moment Angelina set her eyes on Brad, yes people pitied her and were on her side, but they also did it in a a way that seem to advised resignation, like it was understandable that any man given the chance would be crazy not to choose Angelina Jolie. So the blame totally shifted to her. And then came the gorgeous Kids, the sainthood, the public displays of affection and Jen looking like she got stuck in a limbo. So until Jen is seen by the public to move on, the way we perceive that she lives her life, is like a permanent reminder that she is a wronged women.
I do not believe in Homewreckers, I may question the morals of a woman that steps out with a married man and is willing to be a third part in a marriage, but she doesn't have to respect a woman that bears no relation to her. She has to answer to herself in the affair, but the husband certainly has to answer to his wife. Brad Pitt was low, anyone that believes the marriage was over when he started dating Angelina needs a reality check, marriages have highs and lows and the truth is that he cheated on his wife. Regardless of the state of the marriage, the affair ended up being a catalyst.
The ironic thing is, in the end of it all, Brad Pitt is no match for Angelina, he's like a shadow of his former self and something got lost along the way. What looked like a loss of a amazing catch for Jen a couple of years back, is simply looking not so appealing now.