Why is it (white people)?

I expect that you are wrong in a number of ways. First, there's no such word as "raciest." The word you probably should use instead is "racist." Second, honest research usually shows that whites have little to be ashamed of, historically. Although minorities would dearly love for us to feel guilty about being able to out-think, out-innovate, and out-compete almost anyone else, some whites have not succumbed to their propaganda, nor are we ever going to.