it is true that bitcoin is used to launder money from some criminal proceeds, in fact some drug dealers use bitcoin for drug transactions, there is even a movie that tells about it, positively because it is bitcoin known to the world and its price rose sharply, I do not expect bitcoin as a den of crime , let alone the source of illicit money that we should avoid. I hope bitcoin can facilitate financial transactions and also its security
Things are called illicit business they trive in secrecy and government come down seriously on secrecy and illicit. On the other hand, we should remember that bitcoin is decentralized and that means it can not be controlled by just a government or should not be controlled at all. So if we say it is used for money laundering, well maybe the fraudulent people in government decides to take the advantage.