Excuse me but the government doesn't seem to control the freaking currency. They buy it from the dudes at the federal reserve and pay with treasury bills. Where the dudes at the federal reserve get the money from, well I guess they just fucking print it.
I fail to see how basing your currency on a mathematical algorithm is any worse than the shithole it currently emerges out of. Did you think it was based on gold or silver.
Your money is based on something no less intangible than bitcoins, it is based on your ability to pay off treasury bills with uhh. money that was printed by the federal reserve.
So drug dealers price their products in it. That doesn't mean it is a tainted currency. They are just innovative and early adoptors, not unlike the pornographers and the internet.
I for one see an advantage to having a $50 billion dollar drug market priced in bitcoins.