That's one of the more probable cause of this specific issue. There's speculation all over the place in these comments but it's extremely likely that an automatic moderation system triggered these bans... That moderation system may have been responding to a bunch of people flagging posts from those accounts as hate speech or violence.

It's also quite difficult to actually solidly connect accounts with real-world persons - and equally difficult to find reliable streams on who has committed violent crimes (ones that aren't likely to be poisoned by political silencing) and integrate that into your system.

Social media has definitely made this problem on their own, but it isn't surprising to me that they're all struggling to weave a line between becoming tools of political repression and being full to the brim with extremism.