Crime increases due to bitcoin is just nonsense - please have them show objective numbers. Criminals will continue to use any means necessary for laundering their money and committing crimes. In fact since bitcoin is a public ledger that is easily audited, it's harder for criminals to hide their tracks.
You are exactly right, Crime increases due to bitcoin is just a bad thinking.
Criminals may choose that way it is just a choice like the another for few but there is no rule to do criminality only with bitcoin.
So its just a choice for them to choose, so i do recommend to earn with bitcoin and enjoy the profits with out thinking like that.