Nearly every societal problem has a solution, but you need a medical / buddhist / marxist / approach (probably a lot of other disciplines / lenses use this approach too, those are just some ones that more or less follow this).

• Correctly identify the actual problem.
• Find the root cause(s) of the problem.
• Name / describe the state without that problem.
• Outline the cure / steps to carry it out and reach that goal.

The only problems that aren't solvable, are things that would break the laws of physics.

As for drugs / alcohol use, lemmygrad and hexbear have a lot of good threads on drug / alcohol use, and how to view it, and handle it collectively. The USA is probably the worst example of a country to look at for alleviating the societal ills brought about by alcohol and drug mis-use, so its good to look at how socialist countries have tackled it throughout history. If you can't find a thread I'd recommend asking over there, because you'll get a lot of good answers.