Only a fraction of buyers and sellers ever set foot in the forum, and a majority of forum goers aren't stupid enough to base their investments on what someone says over the internet. The recovery was going to happen anyway, and the sell off seems to have been mainly perpetrated by one person with a lot of bitcoins cashing in. It has nothing to do with forum rules. The price definitely started climbing before the newbie forum was put up.
And furthermore, quit being silly.
MTgox is still a very shallow market. It doesn't take much panic to move the markets considerably. I worry about starting a boulder rolling and not being able to stop it.