Bitcoin has only been around for 14 years, while crime and fiat money have been around for hundreds of years, but strangely, we have never heard any complaints about fiat being involved crime and we should get rid of it. It is clear that there are manipulations and misrepresentations that are being spread to tarnish the reputation of bitcoin. Therefore, those who are believing that bitcoin is involved in crime are stupid people.
I agree with some opinions here, bitcoin is just a tool, a currency and what we use it for is up to us. Just because bitcoin is used by criminals and says it is involved in crime, let's not refute that argument for fiat.