Also this is their business, as in what makes them money. If a heated debate about off-color topics comes up it may drive people away from their game. Ergo mods need to keep the peace. That goes for most forums.
Wyrd provides this place for us to chat about their game, and other things, within reason. They are free to do that. Just like you are free to make your own forums where people can post anything they want to. You don't need to fight the rules others make, just make a place where you make the rules. The internet still has a little space left