I could just as easily say 'all poker rooms are rigged'. Neither statement is proven fact as we don't have any real evidence to back them up, all we can do is speculate.
And there has been some dodgy stuff at certain poker sites. The recent scandal at Absolute poker for example, where the guy won a big money tournie and was supposedly cheating by seeing all the hole cards throughout the game, apparently he was an ex company exec who had access to the cheat codes or something.

I don't see any harm in debating this subject.