Over-criminalization of society, and the fall out from the "war on drugs" has ruined far far far far far more lives then illegal drug abuse ever could or would
That is with out getting into the debate on if it is even ethical for a government to regulation what a person consumes, even if you believe it is the current method of criminalization and prohibition is not effective in the stated goal of reducing drug use/abuse, a lesson we should have learned as a society with the passage of the 18th amendment and its repeal the 21st amendment
Ah yes, the old criminalization doesn't reduce usage misconception. Prohibition reduced usage of alcohol and is not why it failed. Prohibition failed for all of the other problems prohibition caused. Usage of alcohol declined, by quite a bit actually.
And the vast majority of people who make it don't have proper chemistry training, lab equipment, PPE, or pure chemicals to make pharmaceutical grade methamphetamine with no impurities or unreacted reagents.
I'm all for medicine that helps people and amphetamines absolutely can, but methamphetamine doesn't help people. It enslaves them.
Get the govt to make it properly, give it out for free in treatment centres where they have to consume it, giving an interface to the addicts for mental health and drug rehab staff (or have a trapdoor that sends the addicts to a gator pond when they walk in the door)
Shall the addicts stay in the treatment center while they are high? Or will the treatment center release them after checking vitals to allow them to go do what they want to when high (which for many addicts is "have as much sex as time will allow")
Because it ruins people's lives, that's why.