Actually there is a distinct difference.
The far left commits crimes and property destruction.
The far right now commits acts of terrorism.
Once again, the Alt-Right are now the functional equivalent of Islamists, and this dude is their internet-radicalized terrorist scumbag who took their ideas and language to their logical extension.
Alt-Right Americans need to be put on the terrorist watch list and no-fly lists, just the same as Islamists. It is functionally exactly the same now.