The Steam Community is a cesspool, and a good part of that is owed to the lack of any centralized moderation. Game communities are moderated by publishers, developers, or their chosen volunteers or employees. If a game is forgotten, its community becomes totally unmoderated, and there's nothing like Reddit's auto-bans to prune these abandoned communities.
Also... pretty sure they just let community moderators do anything they want as long as it's not outright illegal.
I understand Steam not wanting to moderate the absolute flood of user-created content of its thousands of games (on their own), but then, it probably shouldn't force community forums on every single one of its games when the developers can't or don't want to moderate them.
(Also, the ADL doesn't recognize the ongoing genocide of Palestinians so maybe we should just ignore what they think.)