3 problems with that logic
- non-violent drug offenses are gateways to addiction and potential for violent offenses later, or destruction of property, theft, etc to feed the habit
- legalizing weed does little to change the underground drug trade. taxes are high so black market weed is still cheaper and pushed by dealers. regardless, weed will not impact violent crimes linked to cocaine, meth, fentanyl, heroin, etc
- bad people are bad people, no matter what laws you change. being lenient on criminals, especially repeat criminals, drives more criminal activity bc the rewards outweigh the risks.
Disclaimer - i am not against legalization of weed.