Reading comprehension is something that you REALLY need to work on, and lay off the drugs they're not helping you.
I did not claim anywhere in my post that the majority of deadheads who were taking psychedelic mushrooms were really taking store bought mushrooms that are laced with LSD. I did however claim that we deadheads as a whole in the 60s, 70s, and even 80s and 90s were somehow more into psychedelic drugs as a whole than people were in the 60s and early 70s.
You were not around in the 60s or 70s, so you wouldn't know how mainstream psychedelics were back then and yes in the 60s through 80s people did claim that low dose LSD sold as microdots or barrels was "mescaline" or that PCP in powder or pill/capsule format was THC or even LSD. Heck you've probably never even been to an actual grateful dead show when Jerry Garcia was still alive. You can listen to all of the taped/archived shows you want that or go to see the burntout members like Bob Weir and Phil Lesh/further with fake Jerry are still chugging along the dead moneymaking machine but it's not the same as actually seeing a live dead show. It's not my fault that your so called "friends" and family members wasted years and decades of their lives on tour.
I went to tons of dead shows over the decades but I never got into touring or the whole "lifestyle" around touring which is basically being homeless and living in poverty by choice, since I had better things to do, and I would just go to a large number of shows during the year or in the summer. Sometimes I used drugs, and sometimes I didn't. There were no "wharf rats" back then and that did not start until the 80s. The people who didn't use drugs at shows were just either not into using them at the time as I was like this, or they were just more into the music and not total scenesters who were more into the parkinglot party scene than the music, and even still the majority of people at dead shows were into just drinking booze and smoking herb and it wasn't some huge nonstop trip fest like people who like to revise the past like to claim it was.
My friend and his husband who took what they thought were shrooms but were actually store bought mushrooms are from San Francisco and yeah even there you could get ripped off or get other drugs that you thought were one thing but were really something else. You've also probably always had access to factual information about drugs that's written by chemists, or sites by and for drug users like erowid. There was not really any of that in the 60s, 70s, or 80s and yeah even at dead shows and in mainstream society, you would have shady people who would sell weak or fake drugs.