They don't forget, they get told what to believe - amongst other things by the government-controlled news.

s/they/we

tbf it took from 1939 until about 5 years ago for people to forget that fascism is a bad idea.

This comment is proof that too many people think that fascism is just a political brand for anyone you don't like.

Let me tell you as a german: that's not what fascism looks like. Get your TDS under control.

There were much milder examples of fascism than Nazism. And Trump 2 (if that refers to this) is not even a year old.