Criminalization makes little sense, but the reality is that we’ve legalized weed in an era of refined, highly potent strains with legitimate medical uses. Those medical strains, far too potent for responsible regular use for most people, lead to abuse. Yes, such pot does contribute to wrecking lives.
I’d suggest a more mature future involving a cultural shift towards appreciation of strains with content akin to fine wines, not 100 proof liquor. I’ve personally found low thc content plants produced naturally to be far better for typical toking. It might be worthwhile to research “clean” strains and growth techniques focused on producing a mellow high. I’d suspect such strains would be better overall for most marijuana users.