The thing that I have noticed and which bothers me, isn't the type of thread being made, it's that the atmosphere in some threads has grown particularly hostile.
I know feelings are going to run high when a topic is controversial but recently it seems there are a lot of people launching personal attacks rather than debating the points that have been made, nit-picking over semantics or just generally being rude. e.g. expressing joy that someone has unsubbed, telling people to unsub or simply going into a thread to say, 'I don't care'. None of that adds anything to the discussion but it does set a very hostile tone.