There is no way for governments to go after the criminal since it's not yet regulated in some countries.
true there are some use bitcoins in their badly
What does regulation have to do with robbery , theft and scamming?
Are rims regulated in your country? Are they considered legal tender?
If not I assume I can go in the middle of the day, steal your wheel rims and walk away humming since nobody can arrest me or sedn me to jail.
As long as you prove you have owned those bitcoins and those are of value to you it's still a crime.
Regulation or not.
there are some who used bitcoins in their negative ways, they doesnt even think how bitcoin really help us to be more prosperous and assist our needs, and they just used bitcoin as their bad doings, i think that is a criminal already.