I don't "want a world where people can be deplatformed". I am 100% in favour of better censorship resistance, open messaging, etc and I 100% think whatever "bad" comes out of a system like that would be far outweighed by the good it brings.
But that doesn't mean I'm against Facebook deplatforming assholes. Hell I'm against Facebook as a whole, but as far as their current role in society plays? They have a stupid amount of influence over large swathes of the population and that's a problem.
The problem is no matter how I phrase this, you'll think I'm in favour of Facebook "censoring people"; whereas my position is that Facebook has actively given new tools for assholes to spread hateful messages, including not just the groups systems but active recommendations, advertising, sorting algorithms which prioritize engagement (read: flamewars), etc.
In short: I'm in favour of Signal and against Facebook. How's that contradictory?