I came across this article on Cracked.com about the tricks Hollywood uses in order to get audience and viewers root for the right guy in movies. It's a funny article, but ultimately, makes a lot of sense! Especially the parts in the article when the writer cites cases where the things that are happening in a certain movie don't even make sense, but they're there for a reason. And the reason seems to fit the overarching theme of the article, that Hollywood, just may actually be using those tricks to influence viewers' allegiances towards certain characters in the movies.
Here's a link to the article. Worth the read, for the laughs, and for the food for thought therein!