serial killers. O.o

I''ve been watching some shows with my Mom all day and we've been watching these criminal shows. It's like a countdown of the worst serial killers. I've noticed through out all the killers, all of them are white.

Are all light colored skinned people capable of murder?

I realized that most murders that happen day to day are by African Americans or Hispanics while the killers that kill over and over again are Caucasian. I'm not trying to sound racist, that's just what I see in the California news.
As I watch these shows, I think, did they do it because they like killing? Or do they honestly think it's okay to do these things.