That's true. Eg alcohol inebriation tends to make a sizeable part of the population violent; pot eg just makes people hungry and lethargic. And from what I heard cocaine is basically sociopathy as a powder. Etc.

The problem of organised crime has more to do with legal prohibition of a good that enjoys widespread demand, than with that good being a drug. See gambling or prostitution or corruption in construction. I remember some article about 'sand mining mafias' in India. Sand!