1. Action for action's sake - Black Lives Matter protests to block highways.
2. Exploit the fear of difference - Those horrible racist uneducated people are nothing like us, we can't let them take the country! This is basic tribalism and it applies to every major social movement.
3. Rewritten: "To people who feel deprived of a clear social identity, Anti-Fascism says that their only privilege is the most common one, to be good, moral egalitarians. This is the origin of anti-fascism."
Here I've applied them to Western progressivism, but if you deny the basic assumptions of any collectivist social movement you could apply them. Scientology, communism, socialism, fascism. Switch a few unimportant words and there you are with the same meaningless parallels.
The human mind is a great pattern matching machine but has a problem with false positives.
EDIT: It's important to remember when comparing Trump to old fascists that the people who defeated those fascists enacted Trump's policies. For example, in 1945, immigration policy in all western countries was effectively, "whites only".
So if you're gonna notice parallels between Trump and Hitler, you have to notice even closer parallels between Trump and the people who defeated Hitler. You should also notice the differences: Trump is an isolationist who wants to start wars less than Hillary - a lot like pre-WW2 America.