well....there are those on the far right who want to stop all immigration....and some of that far right group would go so far as to remove all the people here who "don't belong"
i am not 100% sure...but i would bet a dollar that someone who has been agitated by hannity, rush, and trump to hate the left is responsible. that seems like a fairly safe bet to me.
that would actually be about the same as the saudis blaming the journalist for starting a fight where he was dismembered and buried in the embassy garden.