Of course bitcoin is the currency of criminals, that's why it was created in the first place, to have a safe haven for criminals. But you need to realize that being a criminal is not a bad thing, it's a good thing.
Now that's something! It's a good thing for the criminal as long as they are not caught, and a bad thing to their victims.
You seem to live under the illusion that every crime has a victim, that is utterly false. In fact, most crimes are completely victimless.