I got chills when I read Tracy Flood of Garland Texas's letter. The thought that a movie could really make people of all colors examine their own prejudices and actions is amazing. When I watched "Crash", I knew it had that effect on me and when Ms. Flood wrote that she had to look at herself because she felt like she was identifying with the racist actions of the characters, that was powerful.
When we can recognize that it is sometimes easy to be racist because of a situation we are in, we can better identify the root causes of racism in general and that allows us to fight it. You mentioned in your review of "Max" that some people didn't like that Hitler was "humanized" in the film but that after all, Hitler was indeed human. Only when we realize that racism is happening all over the world in people very much like ourselves, can we start to see how to prevent it from creeping in on our own minds.