First I want to say that I don't understand the people saying this movie is unrealistic. It's a movie, of course, but it's still LEAGUES more realistic than 99% of movies that get wide theatrical releases. Anyway, enough about those troglodytes.
What I really like about this movie is that it doesn't force any messages on you or tell you exactly how to feel. It simply presents you with a series of memorable characters and events and lets you draw your own conclusions. One of the leads is very arguably a racist; the other is an accessory to several murders. Does that mean the film is condoning racism and murder? Decide for yourself; the movie won't decide for you. And that's just the surface. There many other issues the movie makes you think about. I won't go into detail about what they are because that would involve getting into spoilers, but I will say I found myself thinking about this movie for days after because it's the kind of movie that makes you think, and that's getting rarer and rarer. So give it a shot. Challenge yourself.