You can lay that squarely at the feet of the rich, trust fund, self hating White do gooders, My FRiend. Unfortunately, this is not the first, but they will be many, many to follow. We are now beginning to reap the seeds they sowed, including putting the muslim in the White House. We have became civilized to the point to where we are selling the body parts of aborted [legally murdered] babies openly on a commercial scale.
The truth is that the only way to avoid something like this is to not be there when it happens.
Let the White Progressives be the ones who get targeted. Like that Pajama Boy guy who got himself butchered at the Rhode Island Metro Station in DC on Juky 4th for refusing to give up his cell phone.