Yes, just like if Glenn Beck really did not rape and murder a young girl in 1990 he would be very adamant about his non-involvement and would work very hard to expose the actual culprit: http://en.wikipedia.org/wiki/Beck_v._Eiland-Hall
A parody is just that, we're talking about a several day long real attack here.
And if you read that article you'll see Beck sued to get the domain. So it's not like he ignored it, and besides it was obvious from the beginning that he wasn't the one that registered the domain.
