I really don't understand the whole Bitcoin thing and I'm not sure why people keep posting how much they're trading for. Is the government going to drop the USD in favor of bitcoin or something?
What if I then told you that the US government spends billions of dollars fighting counterfeiting and governments like North Korea profit by printing USD.
Cheaper on the budget. Safer on the homefront. How could they say no?
(That being said, them actually accepting Bitcoin is insane, using the technologies Bitcoin has pioneered though... That could happen.)
The hacking you speak of is more akin to bank robbery.