even if you are a large, old and successful business, you don't mess with the US government. Pokerstars is a billion dollar business but still not legit in USA, and Bitstamp could totally have its Black Friday considering that legit US exchanges are about to open and they are an "unfair" competitor.
Yes, why would anybody mess up with the entity that has more firepower than the rest of the world combined..

But wait a minute, they must be
very unbelievably scared of us. How else would they need so many weapons. I don't have any, because I am right.