It's even worse than that. Most of them are incapable of understanding any kind of nuance. To them every issue is black or white. And everyone who doesn't agree with every single point on their extremist agenda is an identical enemy.
And Lemmy (or at least certain instances on Lemmy) is infested with them. Which means they go around in clusters, swarming anyone on the other instances who doesn't conform with their impractical ideology and blinkered views.
Edit: Ooh, looks like they found my comment! Just wanted to add a special note to them: grow the fuck up!