Bitcoin has nothing to do with crime
The decentralized nature of the technology is making people use it for criminal activities. Since the coin is decentralized, nobody knows and control your funds. No currency support crime but it is the criminals use them to commit their crime. Bitcoin came and see crime so nothing can be done to bypass that angle of the bitcoin activities. Crime is not written on the forehead of the criminals so they use it to execute there plans and transfer their money from the victims account to there wallet.
That may be the case and the blockchain transparency should be the one to nullify this intention but the presence of mixers restrict the transparency to do its work of tracing coins if ever there is a transaction made to pay for the crime or used as money laundering.
We all know that things are neutral they don't have evil minds and have no self control to do crimes. It all goes down to the person and how he used that thing. While Bitcoin is being used to launder money, Bitcoin is also used to save lives by funding charities that support and maintain the lives of our less fortunate neighbors.