I had a feeling something like this would happen. The right jumped on the "it was a radical leftist that did it!" almost instantly. Democrats made the same mistake with the Vegas shooter, assuming it was done by a conservative nutjob, but actually just an apolitical psychopath.

I've learned to never assume political affiliation when I hear about these things happening because someone on the right is just as likely to be the perp as someone on the left for the same reason.