I didn't see the thread last night so I can't comment on how quickly it needed to be deleted.
However, I do think we sometimes have an expectation that just because something is reported, MNHQ will do what we think they should do. And that we need to give them time to read a thread before they can decide the correct way forward with it.
Some, yes, should be obviously deleted. But I think people get het up about grey area ones and feel ignored very rapidly.
My suggestion would be a message, on thread, saying 'we are aware of this thread and are investigating. Please bare with us.' so that we know it's at least been reported, even before a deletion message or deletions appear.
Worra's 'call out thread' was left up by accident, as HQ said they had a technical glitch. The internet isn't fault proof, after all. If it was, it would be a much more boring place. 