Who is behind the current racial unrest, and what do they gain?

Harry Lewis observes: “Two NYPD officers, one Asian and one Hispanic, were shot dead in Brooklyn execution-style by a black gunman who identified "revenge" for the deaths of Brown and Garner as his motive. The gunman had murdered his girlfriend in Baltimore the previous day. The racial tension on the streets of New York and the nation fomented by the President of the United States, the Attorney General of the United States, Sharpton, and others, and encouraged by the mayor of NYC, among others, has created an atmosphere in which violent criminals are emboldened to murder police officers in cold blood. Anarchists, communists, and fascists who have been stirring the racial pot for months with protests and demonstrations are celebrating these murders. The multicultural polarization of America, the deliberate policy of the Democratic Party, is leading to race hatred and cold-blooded murder. Is race war next?”