I don't want to live in a society where law enforcement is left to big tech vigilantism. There's a reason that governments are granted a monopoly on violence, they have democratic legitimacy and accountability that other entities do not.
Because law enforcement (at least in the US) is woefully bad at their jobs and don't care. I have first-hand experience with this when I had a close friend who was being harrassed by someone local (we knew who it was) and LEO refused to lift a finger. I've talked about it multiple times before on HN [0][1][2][3] but even with this guy graduating to physical actions (keying the friend's car, following/stalking them) the police did nothing.
So if our only options are "Have the police do nothing" or "Have a private corp decide to not do business with a company anymore" then I know which one I'm picking, which one will actually help reduce harm. Even if they spin up under a new name they will lose users along the way. Deplatforming works.
[0] https://news.ycombinator.com/item?id=32521976
[1] https://news.ycombinator.com/item?id=31610876