I believe Steve Gibson, of Security Now, called it the "crypto-dilemma". On one hand, it could be tool of political activists to resist repressive states such as China and Libya. On the other hand it could be used as a tool to launder money from kidnapping operations and organized crime activities.
On one hand bitcoin could be used as a tool for political activists to resist oppressive states such as China and Libya. On the other hand, bitcoin could be used by political activists (ie: silkroad) to resist oppressive states such as the USA and EU. Much like how Tor can be used as a tool for political activists in China and Libya to resist oppressive states, and can also be used by political activists in USA and EU to resist oppressive states. If Bitcoin is a threat or not largely depends on how brainwashed you are by your respective government. Much like Tor, Bitcoin is a weapon against statists in general. The government will love using it to attack other governments, and will fear it being used to attack their own power over their own slaves.