Anslinger was one of the most serious bureaucratic prohibitionists, immediately after its repeal was appointed to commission the agency associated with drug prohibition, did a 180 on all of his positions on Marijuana, and doctored scientific evidence to push for a new enforcement target, since he was given a large powerful agency with very little to do. Without a witch to hunt the witch hunter fades from relevance, so he manufactured one, and that's why we are where we are today.