Do you really think no crimes are ever committed by white people? A crime like this is actually more likely to have been committed by a white person. In the Bay Area since the 60s there were numerous college aged women killed by white men like Edmund Kemper or Herbert Mullin.
Um, no.
It is my understanding that black people commit every category of crime at a higher rate than white people, even white collar crime like embezzlement.
Additionally, if for some reason all people off color disappeared and only white people remained, America would have a crime rate akin to that of Norway - The part without the muslims.