I'm completely convinced that the war on drugs was only a ploy to act against outsiders (Asians and Latin Americans), and to give away money to privately owned prisons. Also, to put tons of black people in jail (that's what it's great at, anyways). Anybody that knows anything of how effective (well, ineffective) trillions of dollars in government spending over 30+ years was to bring down the drug use in the US knows that the war on drugs is a complete failure. A failure and an attack against the basic human right of self-ownership.
I get to harm my body however the I want. Should taxpayer dollars be wasted persecuting everyone destroying their body with fast food? No. Should the government persecute people using drugs? No. "But people might hurt other people when high!" Some say. Yeah, the same risk is inherent to alcohol. What we do when is that we don't go arresting every single person that drinks, rather, we prosecute drunks for hurting other people (while drunk). And we let the rest of the people consume alcohol, because they have the right to.
You have a good point regarding law against bad behavior, instead of law against mental condition.
But (bolded above) confuses cause and effect. Most laws are passed with generally good intentions - but solutions are voted in which are capable of being corrupted. Then over time, the various styles of corruption creep in. That's seen in a lot of situations.
That's way different than arguing that they are passed conspiratorially, with hidden intent.