My opinion is, it all depends on how the person is using bitcoin well or vice versa, it may be very easy for somebody to use bitcoin for something bad, but it can be traced easily, we can see where we can see so many people which transact on a daily basis, so it could be possible the crime by using bitcoin will be quickly tracked by the authorities ...
their limited knowledge of bitcoin makes them claim that bitcoin is a criminal currency and is always used for illegal transactions.
the rules should be established so that Bitcoin users can be watched and protected.