The re-legalization of drugs is a venerable and defensible conservative/libertarian/limited government position. Bill Buckley and Milton Friedman held that position back in the '60s.
It's an issue, where men of goodwill can disagree. Prohibtions are generally speaking a liberal solution to a problem.
Roosevelt opposed Prohibition.
The reason he is for drug legalization in this country is that he knows it will bring national healthcare, the socialism. If drugs were legalized tomorrow, the govt would be obliged to take care of junkies, and the average person is going to decide they deserve the govt to fund their healthcare, when they see drug addicts getting it. Libertarians are being taken for a ride by Soros. One day, they will wake up with a bad hangover.