Why does this even matter? According to Fulton, when immaturity and asshattery is allowed to rein supreme, it discourages large swaths of a potential player base from continuing to play, or even from signing up in the first place. Certain demographics, like women or older gamers who get enough childish antics from their kids, are especially resistant to this kind of behavior. If you look at a game like World of Warcraft, which is so eminently successful in these demographics, they've implemented a number of elements (like profanity filters, graveyard rez's, and reactive city guards) to keep the idiots at bay. When you're trying to emulate WoW's success, it's an feature set you'd be remiss not to include.