Well, it is not the problem with Bitcoin but the human involved. There are also cases whereby people buy and sell drugs or involve in any illegal activities using fiat.
Indeed, the only problem is us not the coin itself. Few of us tend to use bitcoin in evil deeds because of its anonimity, they know that they will not be discover. And that is why other country ban the bitcoin because they think it as a threat.
I agree to that. Bitcoin is good to use in different transactions and other people take that opportunity to used it even in illegal services because it is hard to find out who are the people involve in it. There are people who abuse the use of bitcoin and become greedy to earn more profit. The government have to make an actions on that and only banning bitcoin is their only way for that.