That doesn't mean that it's an "invented crime." It's undeniable that drugs, gambling, and prostitution have real social costs and harms. The people are entitled to regulate commerce in their society generally, but trade in harmful things especially. When people uses organized violence to circumvent that regulation, in the pursuit of profit, that is actual crime, not invented crime.
> Large numbers of violent crimes are done by people involved in drug dealing or consuming.
You're presupposing a direction of causation here. Your average street gang does not exist because of drug dealing or consumption (and indeed, violent street gangs long predate any restrictions on drugs or alcohol). They deal in drugs because it's easy money, but arise for other reasons.