Criminals have been around all along, only a bitcoin is used as their transaction. Bitcoin does not cause criminal activity to continue to increase It's just that bitcoin can make it easier for them to transact without having to meet.
Well i agree with you that many criminals now is being smart and wise by using bitcoin for there transaction, and i am sure that right now many criminals now is engaging themselves with bitcoin, because bitcoin is the future and there identity is will not show with bitcoin.