I don't have a psychological disorder but it's definitely relevant of you to bring up the fact that the police also kill a lot of people with mental illness. 
http://www.rudermanfoundation.org/news-and-events/ruderman-white-paper
http://www.nbcnews.com/news/us-news/half-people-killed-police-suffer-mental-disability-report-n538371
Black men accounted for about 40 percent of the unarmed people fatally shot by police and, when adjusted by population, were seven times as likely as unarmed white men to die from police gunfire, The Washington Post found. “Fatal Shootings By US Police Officers in 2015: A Bird’s Eye View,” was conducted by criminal justice researchers from the University of Louisville and the University of South Carolina.
Your definition of racist is curious. Have you ever formally studied American history? Have you heard of Plessy v. Ferguson (1896)? That ruling wasn't overturned until 1954 (Brown v. Board of Education). How about the Voting Rights Act of 1965?