Albeit many criminal act are been carried out using bitcoin as mode of transaction. This a terrible issue facing the crypto world cos the king of crypto is been used in such dealings.
For decades crime has been in existence and are been carried out daily through many forms and in every sectors, fiat has been in existence long before crypto will ever think of been in the picture, my point in essence is crypto is not the root or cause of criminal activities, yes some people use this for bad intentions while others use it for the opposite, and same applies to fiat, can't totally rule it as bad.