These people shooting at other races, that can bring retaliation... and in a way, some of that has already gone around, it's almost like this is some "plot" that was hatched to stir up problems.
I've always thought, those who are so warped to mass kill, no matter who their victims are, also invite retribution on their families. I mean, that's how I'd see someone wanting vengeance and at least, I've heard of those kinds of threats made with past incidences.