The difference between right-wing terror and left-wing terror is the latter has been co-opted and turned into the street enforcement arm of a mainstream political party. I mean, don't you think it's weird how Antifa was able to organize DisruptJ20 and the Floyd riots, but is just absolutely MIA as Drumpfitler implements fascism in America for real this time? The reason is taht antifa is run by the Democrats.
This is also why left-wing terror has mostly stayed low-level over the last few years. They have "legal observers" working with domestic terrorists to make sure nothing they do gets so bad that the public starts demanding answers and demanding for the terrorists to be brought to justice. An occasional bike lock on the noggin or parking lot shooting can be excused; bombing Congress would get too much attention. Although they did have armed goons take over a city center in Seattle. That sure got cleaned up fast when people started dying.