There is one thing you can bet on.....had it been a White guy that did the shooting, that would have been the first thing out of the mouth of the press. AND......if the shootings had been done with an AR, there would have been more calls by the liberals to outlaw them.
Since there were some Blacks killed, it's pretty evident that the shooter wasn't just targeting Whites, so my best guess is that he just snapped and decided to pay back the people he had worked with.
