Again, people should stop comparing Trump to a nazi because it understates how horrible the nazi's really were.
I don't really agree with this sentiment, because it serves no practical purpose: "understating how horrible the nazi's really were" is not something that's going to cause any actual problems. It's on par with worrying whether we should ban video games where you play Ghenghis Khan because they trivialize
his brutality.
Everyone gets that the Nazis were bad, and saying the were a little more or less bad is entirely academic at this point. Maintaining Nazi "evil cred" isn't in itself a useful concept, except to make our own side look good in comparisons. That can be harmful, e.g. I've seen the USA's
evil Tuskagee experiments on black men dismissed as a non-story because they "weren't as evil as the Nazis". That's harmful when evil medical experiments in the USA are justified by merely being less evil than Hitler. Hitlers ultimate evil cred is therefore used as a whitewash on our own evil.
The point is, and this is actually cautionary thus has value, is to remind people that Hitler was elected, and the type of rhetoric that Hitler espoused before he got elected. "Well surely Trump won't be that bad" is exactly what people thought about Hitler. Nobody ever believes the guy they voted for is going to be the biggest asshole ever, but Drumpf is indirectly talking about building the yuuuuuuge police state infrastructure that would be needed to deport 11 million people and handle their 4 million children. That's almost 1 in 20 of the entire population that would come under government control, and they'd be in camps for many years while the paperwork is sorted out, let's not kid ourselves about that. Such an establishment can't help but turn into a monster.