They do. One of my Admins asked for this feature, I'm sure he can describe how he thought it could be used positively.
People will sometimes say things more honestly if they are anonymous. While some will use it to say the c-word in an attempt to hack Darla off with no retaliation, others can use it to talk about something more honestly than they might otherwise if they felt people would know who they were.
I don't get that, why would anyone be afraid to say how they really feel here, hello, we are already anonymous?