They live in a bubble that's been telling them since they were suckling their mom's tits that the other people are the fascists, and stealing lives and freedoms in broad daylight (the opposite of reality). Add to that the heavy gun culture and nationalism, and you get a mob of people wanting to shoot the 'other'. Last year a dude was asking Charlie Kirk in public when they should start killing liberals https://www.youtube.com/watch?v=rxNFXJmNhbA&t=15s