Well, if criminals are using Bitcoin then they were using fiat currency before 2009, right? So if governments are banning Bitcoin, for this reason, the same logic should be there for fiat currencies. However, coming to the fact, governments can not ban crypto to crypto transactions and they should not blame Bitcoin for the criminal activities. Everyone would use what is convenient for him and it doesn't make any sense to destroy the whole system just because the tiny group of people are using it for illegal activities.
That's the great opinion. But if they didn't make a regulation for this crypto, that crime transaction will be easier by using this crypto. And the worst thing, maybe a lot of corruptor using it for money laundy.