People will never stop committing crimes because of different reasons, but let's talk about money or cryptocurrency. Fiat and cryptocurrency are both money, the only difference is that crypto is digital and has more value than fiat in my opinion, so, you were saying or thinking perhaps that if we all use cryptocurrency, we could minimize the crimes, but let me tell you this, you can't, we can't.

If cryptocurrency will replace fiat, then crimes would still happens, for example is robbery, people will rob other people by in any means just to get cryptocurrency to sustain their needs for everyday lives, so on and so forth.

Crimes that are being committed by different people everyday is all about the person, it is all a matter of choice, even way back then, in the stone age, or old age, people are stealing, killing people, but it can't be called crime since their are no laws yet before, but it is existing already for a very long time, it is like a habit, once you did it, escaping it would be hard. Also people are committing crimes because they are out of options, they can't find a job therefore they steal, they kill for money, it is just what they called "Survival of the fittest"