The response is corpus dilecti, which is the principle that there are two elements to every crime 1) the harm done by an actor and 2) the knowledge or willful ignorance that harm could be done by said action. This is why insanity is a defense. or in Mark's case, stupidity.
Mtgox AML Policy - Money and BTC come in but never go out.

Who in their right mind in transferring fiat to Gox now?
Unfortunately, many novice bitcoin owners will choose to sell their BTC at MtGOX because (a) it seems to offer the best price, by far; and (b) it is still cited in the news, blogs, and chart sites as one of the main exchanges.
billy is referring to depositing fiat in Mtgox which is much worse than selling your BTC on Mtgox.