The OP asks an old question: “what about the demand?”
It’s a fair enough question, standing alone.
But if we can eliminate the supply and the suppliers, we won’t have to worry so much about the drug abuse problem.
It was just a few days ago that I suggested we need to address the demand as well as the supply issues.
Just to be clear, though, taking advantage of the addiction problem is not justified by telling us that we have an addiction problem. We do.
But, we can and should still insist that other nations STOP allowing the supplying of those poisons to our addicts.