Hacker News is also social media - at least by most reasonable definitions of social media. Should it also be banned?
Then all this will be synced with govs so can read all your messages. And sell to ad companies to spam you later. (They can link your phone number, email etc to you as you provided real id on all those).
And if you travel to some country that doesn’t approve what you ever said, maybe you broke their law, so you deserve a few years in prison.
Further, if in some contrived scenario we had to lose HN to get rid of all social media, I'd happily do it.
There's no perfect solution but some are significantly better than others.