The money people use to buy drugs can be put towards treatment. And then there's the countless billions of dollars we're already wasting on an unwinnable war that has accomplished nothing and only serves to make matters worse the longer it goes, disproportionately punishing those at least fault. That's a lot of perfectly good money which we could be putting to much better use, partly drug treatment but also infrastructure, education and social programs to generally help everyone, especially homeless and poor people who are mostly being hung out to dry in our current society. Or you could just be a selfish piece of shit who only cares about yourself, but the rest of us who actually have a shred of humanity will keep right on caring for others and working to better all mankind, no exceptions.