People who want to keep recreational marijuana illegal necessarily belong to one of two groups:
1. Deluded, confused, or misinformed people.   2. Evil people.   There is no third possibility that I am aware of.   Ordinary citizens such as soccer moms, religious folks and the elderly usually fall into category 1 whereas lobbyists, politicians, prison union officials, law-makers, and pharmaceutical company CEOs fall into the other one.   If one attempts to reason with an individual from category 2, obviously they won't admit to being evil or to having immoral motives. They will inevitably pretend to be from category 1 and claim that marijuana is very dangerous, harmful and often leads to harder drugs, but they know otherwise.