Usually about once a year or so someone starts one. Usually to welcome the new users. Of course it ends up flushing out a few trolls with 'All gays deserve to die' and all sorts of weird obsession with how other's live. But the mods do a good job 'straitening' people out.
Personally I'm a big support of letting people live how they are, embracing Marriage Equality, and that it's wrong to judge people over silly things.