Never played Garry’s Mod, but having played a handful of ww2 games I'm very familiar with this sort of issue. Most the time these guys are originally just edgy kids or young adults trying to be "funny", but it always goes too far.
I also have a lot of respect too for Garry doing this as these Hitler enthusiasts tend to be the type of people to harass anyone who tries to ban them or stop them from "being funny". Banning this stuff game-wide takes a lot of stress off of the individuals playing the game and trying to self-moderate their communities.
