I'm uncertain who deleted it, deletions tend not to be in logs, because the objects simply don't exist anymore... I saw Alastir and Vishra both in there last I saw it still existed. Beyond that, dunno.
I agree that they're nowhere near as high in raw numbers as PC post rates, but PC has a broader topic set of discussions that people are posting on. Based on metrics available from our admin console, clicks and posts have been high. If you were to removed politics or the MacGyver topics on these forums, I'd estimate they're at approximately 80% of PC's post rates.