I do not think criminality is due to bitcoin. it depends on people who use bitcoin as a way to commit criminality. Many public misconceptions about the many uses of Bitcoin by criminals, but the thought is wrong thinking. This thinking is caused by the many people who think that Bitcoin is anonymous, people think bitcoin is the source of the criminal act. paper money can also be used for criminal acts, such as buying forbidden goods ... or using it to hire criminals. bitcoin is not used for it.
Exactly. People who are bad or let say criminals will do every possible way to earn and execute their criminal ideas. Just like you said even paper money can be ised by them. Actually that was their tool for a long time. Maybe they are using bitcoin right now as it is more efficient to do that hides their identity. And even makes transactions hassle free.