There's strict liability (without legal regulated supply we have essentially zero liability) and there's near-genocide.
"Scorched Earth", "erased as the war criminals and pestilence on humanity they are", further abused, forced into same-sex incarcerated relationships. We've tried this. It hasn't solved yet.
"Just kill them" for climbing without a rope? For risking their long-term health for short-term relief from physical and mental trauma and subsequent addiction, for not violating anyone else's rights but their own, you think you have the right (and moral obligation!) to violate their rights? Because they're inferior. They're an eyesore. "Eliminate the weak!" (who aren't violating the rights of others). Can you think of groups of people in human history who have taken that approach, violated the rights of others, and been cured by subsequent prison?
With the savings from not paying $50,000 a year for learn-to-silently-move-tax-free-contraband-in-cool-school incarceration and attempted concurrent rehabilitation (while the right to address personal health matters is denied), there should be plenty of money to prosecute property crime and littering and biohazards. Let me just reward you with food, a place to stay, gangs, and zero need for personal financial responsibility.
You litter in the street, the park, an alleyway, where f'ing kids play, you spend some of your time cleaning that s' up. For free. Because that's violating the rights of other people.