They banned people, because they were on other end of political spectrum as Patreon management folks are.
I certainly don't think all the people I don't agree with are Nazis, although I do think all of them are to some degree wrong.
If you would like I can expand on my definition of nazi but I think it is likely to be a pretty middle of the road European definition of nazi, in the end.
For the people who were banned, it was more of digital mob lynch than any appearance of rational thought.
I usually do not put people who do I do not agree with into the being wrong box. Maybe they considered some argument I didn't, and that's how they came to their conclusion. Of course, the opposite is also possible, therefore the discussion, with exchange of the arguments, is the best approach.
Pre-labeling someone with the intent to smear their character damages the discussion. Preventing them to say their argument ("de-platforming") does the same.
AFAIK, the people who were banned were Canadians.
It's not that Youtube is any better; they are also banning and demonetizing people without being able to point out objective specifics.
Edit: the brigade is here.
And yet you're certain the reasons were politically motivated.
Ideological. Between the point of view that these banned were arguing for, ideological leaning of Patreon management and the shifty argument for the ban, it doesn't take much brainpower to figure it out. In other words: it it wasn't ideologically motivated, they wouldn't have a problem with giving a straight answer.
Who was banned?
It's Going Down on the other. This one was due to pressure after banning Lauren Southern and "don't be hypocrites, if you are going to invent new rules on the spot, at least apply them consistently".
Whether or not you've got a political grudge against Patreon, the simple fact of the matter is that Patreon does currently provide a sense of security for creators who feel very insecure on the capricious youtube platform.