Economics would tell us that if you decrease the supply of something that has a high demand, then the price will rise. That means it's more valuable for criminals to distribute, and they will also use more violence to protect this trade.

So while we're cracking skulls to achieve your drug-free nirvana, we've basically consigned a generation to hell. Constant police patrolling and intervention in their communities, extremely violent narco-traffickers, and yet somehow no treatment for addicts.