They will literally tell you the Left have never engaged in political violence in the US, despite being the largest source of political violence in American history. Most people don't know anything about the Communist revolutions of the 19-teens; the Labor riots, the Coal Wars, the Days of Rage campaign, the Long Hot Summer, the bombing of the US Senate, the attempted assassination of both houses of congress, so on and so forth. Most of these attacks won't even be listed in Wikipedia as terror attacks/campaigns, and some of them will even be called right-wing.