I fear the consequences of deplatforming someone if it's not through a legal process and because they have clearly broken some law, specially involving their platform.Which brings me to my next point. Why would you be conflicted about removing someone like Tucker Carlson from their platform? He can still exist, he's just not able to radicalize your grandparents anymore. What's the harm?
I think it may lead to normalizing deplatforming as a way of censorship. I think this could be abused by powerful people.
Nobody is perfect, so if they want to shut somebody they will be able to find some skeleton in their closet. Or they will just make one up. But I think I'm being naive and this has always happened, as you stated before regarding "discredit campaigns" of the right (I would say of anybody that has power over media).