Somehow, it's mostly accepted that making it harder to intentionally kill oneself is not the right way to stop people from committing suicide. Yet at the same time, we still consider this total war on drugs the correct approach to preventing people from killing themselves with drug abuse. The sibling comment is right.
Alcohol is legal, how does it follow that there should be more iterations of addictive substances that do more damage to the fabric of society?
Things that cause drug abuse, especially the most harmful ones, are:
* lack of education. This was sometimes on purpose, with drug companies lying to get people hooked on opioids
* poverty and despair in general
* mental health
* many other things
Those can and should be fought, and they are a lot more effective than policing overall, and also a lot cheaper.
It's more common to find people who start addictions from a financially stable position where they have some discretional income. Rarely do people begin addictions where they have to decide between food or a drug they're not addicted to.
From the very beginning the American war on drugs was motivated by racism. It’s just another state-organized genocide in disguise.