"just make it legal" has unintended consequences. The cartels, faced with the loss of income from illegally selling now-legal weed didn't starve. they didn't go "oh, hey, I guess we should stop being criminals". No, they pivoted to heroin which turned into dealing fentanyl with disastrous results for the US. We'll keep losing the war on drugs until we start fighting it with community assistance programs and jobs and houses and doctors and therapists.