I think if you're not trolling then you're an idiot. Race has nothing to do with a crime or motives except for the occasional hate crime, and even those are debatable. It might have been relevant once in the early to mid 1900s when the world was full of racial prejudice and minorities usually had to work crappy jobs and as such got caught up in a lot of crime, but in the 21st century that kind of thing barely exists anymore.
I don't even know where you're getting that race is relevant to their motives. Jeffrey Dahmer killed people, drilled holes in their skulls, and injected acids because he thought it would turn them into eternal sex zombies. If you can deduce that from the fact that he was white, then get your ass to the police department right now.