There is no such thing as selling tens, maybe hundreds of thousands of coins for a million dollars in a weekend on MtGox and withdrawing it through a bank without getting noticed. Never mind that the bank knows every personal detail about you.
Wouldn't it be easier just to go to a country with no extradition treaty with the US?
Just FYI - *Stealing* Bitcoins is not a crime. Not a single legal system anywhere is going to care about this.
Sure Gox has froze funds related to suspected "hacks" (hacking is criminal) but why would they bother to impede pirates cashout of bitcoins legitimately handed to him?