Your entire argument appears to be motivated by your own personal anecdotes. They carry about as much water as my own, as a someone who smoked casually, gave it up, and tried weed a few times, and didn't stick with that either.I never said prison was the best fate. I never said that. I said hey prison sometimes works, so what. But it ain't the best.
Perhaps rehab. But I'm not an expert. But hey for all my life, and it matters to me, I know the danger of getting addicted even to something as readily available as alcohol is dangerous. I know that. So I always made myself the favour of avoiding it most of the time, I just drink perhaps once or twice a week.
If people can't learn self-control, they should have some sort of check. And perhaps the fear of getting caught and going to jail is an useful deterrent, even if not the ideal or fairest solution. Nuff said.
I'd call myself a pretty heavy drinker, but there are entire months I've gone tee-total for (for a variety of reasons: health, money, charity).
Who wins? We're back to my questions about ethics and morals, though this time an answer that doesn't devolve into circular philosophising might work better.