[argumentum]

There seem to be many flaws, but rather than go through them now, I'll assume that only 20% of incarceration is drug-war based.

Great, that means if we end the drug war, we'd get 20% reduction in our world-record incarcerated population. A half-million more people (roughly) will be freed to get treatment and attempt to contribute to the economy and society.

That sounds like a great start to me.