You can decode exactly what happened in the first couple of years of High Times magazine in the 70s.

One drug was okay (pot), other drugs were mostly ok (psychedelics), and then it became "all drugs must become ok."

High Times, now exclusively a weed magazine, was back then a weed and coke magazine. Coke culture was different but clearly blended in with weed culture (though nothing about heroin; that was already in shitsville).

This is that old complaint people have about reefer madness: a kid hears all drugs are horrible, does weed, is fine, assumes it's all a lie.

I am fairly certain this escalation to hard drugs among Boomers was part of this mentality.

Grace Slick (Jefferson Airplane) has in a few interviews I've read completely dismissed the 60s as largely ridiculous because people placed too much emphasis on drugs.

It's too bad they can't unwind all that and asked, "What if we just smoked some joints and never did anything else?"

I also think most people who have been through rehab or have had addiction problems get way projecty with everyone who does drugs has a problem. I worked for awhile at a psychologist's office, and all of the people who worked there were ex-addicts of some sort.