It's about a lot of things. Blanket banning something that has any benefits at all is anti-science. It may turn out that psychedelics can teach us how to cure lots of psychological problems without the downsides of drug use. Maybe some criminals can be cured of their behavior. Maybe they can bring us closer to the "divine". We don't know what is possible because we've left it to hippies and CIA (but I repeat myself) thus far.