No, you don't understand the situation, because you don't realize that Marixsts / Communists / Socialists are INFINITELY WORSE than Fascists and Nazis. Fascists and Nazis are bad, sure. But Marxists will put you and your entire family against a wall, gun everyone down, and claim that you were victimizing them by not working hard enough to give them free shit.
Marx's bad ideas have caused untold amounts of suffering every single time they've tried to implement them, and rather than recognize a stupid fucking idea when they see one, Antifa thinks this time it'll be different, because this time they'll be the fucking communist dictator.