User blog comment:SQhi/New Forum Feature in Wikia Labs: Do Not Enable/@comment-1455034-20121204194622/@comment-3060206-20121205011510

Features such as chat, Category Exhibition and Achievements are optional in the sense that they can be adjusted on a per user preference. If you don't like chat, simply don't go on it. If having it on the sidebar really bothers you, hide it on your personal CSS.

Arguably, there is always a risk that is taken when a person visits the wiki and even chooses to participate in social features such as chat, so the point that "users might do such bad things-and-such" seems practically applicable to almost every actions done on the wiki, or the Internet, for that matter. Part of the functionality of features such as chat or blogs is the way the users on the wiki handle them. Yes, there will always be the one user who decides to mess with the system, but if, based on that reason, everything with a risk is disabled, there would be no wiki to edit on.