Not if your goal is to censor a viewpoint. They are one in the same whether it's a viewpoint made in public or private - the main point of censorship is to not allow you to communicate certain thoughts. It amazes me that some posts here (not yours, but like the one you're responding to) have already seeded the censorship ground. For them it seems the question isn't whether it's ok to censor opposing viewpoints, but whether they should be told they've been censored. The censorship part is a-ok, but not if you're not informed?

I've moderated a forum before. Some people on the Internet are just crazy. If you ban them, they will come after you—maybe even in person. Shadowbanning on forums (setting aside the FB case) is sometimes abused, but it serves a vital purpose: preserving the time and safety of volunteer moderators.