One of the best features of Bitcoin is its anonymity, this feature becomes a new crime opportunity under the guise of Bitcoin such as money laundering, illegal drug transactions, to human trafficking. This if left unchecked will bring up the pros and cons, so some countries think this bitcoin is dangerous and that potentially kills Bitcoin, there must be a way to anticipate it!
Bitcoin is like any other currency that serves as a medium of exchange so anyone can use it like any other currency. Yes, we all pout at evil but let us alone; do people not commit crimes before bitcoin comes? What currencies are they using? Criminals will always be criminals whether there is bitcoin or not.