I despise Trump, but a great deal of this article is nonsense. Bernie Sanders is the candidate who has BDS supporters on his core staff, not Trump.
He doesn't mention BDS, but he does point to antisemites on the left, seems to be the point of the article. This isn't an issue confined to one political spectrum as the media likes to suggest. Add in BDS, which would contend it's not anti-Semitic, and other Bernie supporting groups, along with radical supporters of illegal immigration, race based groups and anarchists, violence is dominated by the left.