I don't disagree with that either.
From all the research I've done, this echoes the sentiments of the majority of them. The Nazis were terrible, but the communists were even worse.
The fatal fallacy is accepting the you have to choose one or the other. I reject both and refuse to accept the "us or them" framing that is used by both sides. Yes, right now (and for quite a while) most of the authoritarian power is on the left, but the push for authoritarianism is growing rapidly on the right. Accepting this framing is like deciding if you want someone to break your left leg or right leg. What a stupid choice.
Hitler/fascism isn't the opposite of Stalin/communism. They're both destructive, evil authoritarians.
Black Nationalism isn't the opposite of White Nationalism. They're both racist, violent ideologies.
The Bloods aren't the opposite of the Crypts. They're both criminal gangs/organized crime.
Trump isn't the opposite of Clinton/Obama. They all care more about their own power than what's legal and good for the country.
Sorry folks, pinning your hopes on a single charismatic leader to save us is feebleminded and un-American. Idolizing politicians is the last thing we need. It never ends well.