I'm sure this is a silly question, but... under what law is it illegal to steal bitcoins, exactly?
Convincing a judge there was an actual theft is going to be your first challenge; unless laws are updated the theft of bitcoins doesn't obviously fit into existing rules that were designed around physical goods or fiat currency.
The line gets very blurry especially when you start accounting for MMOs with official real-world economic links like EVE.
I'm not saying I think theft of bitcoins shouldn't be illegal, just that the situation is a lot blurrier than some people seem to think, and until someone is convicted for (or at the very least charged with) stealing bitcoins there's really no point in debating the matter.