I thought about this years ago and came to conclusion its because of base emotion these ideologies highjack.

Nazis used disgust hidding behind superiority complex, which pretty much everybody sees as bad emotions.

Communism uses jealousy hidding behind false compassion. "Damn billionaires have too much! We need to give to the poor!"

And compassion is generally agreed to be good emotion. Thats why communism is still here. And ofc socialism is just communism lite - before hunger and shooting starts.

European countries are only "working" socialist because of capitalism providing. Destroy that, get starvation and you get the classic soviet-style "face the wall!"

We are gonna make it, majority however, wont.