To me, it's just plain disrespectful.
It is. Half of their audience probably didn't even notice though
As I recall, attendance actually dropped quite a bit for a while. This was about the time they were kinda fucked by yet another manager and were in dire financial straits. They proceeded to bust out a handful of pretty shitty albums and Jerry would check himself into rehab for a heroin addiction. He had a (and this is eighties dollars) a $700 a day habit. So, he did all sorts of other stupid jobs and gigs.
The history of the Grateful Dead is pretty interesting. There are a number of good books on the subject, but I recommend Planet Drum by Mickey Hart as a good starting point.
I know a friend who had a bunch of shrooms, like a whole trunkful and followed the dead around from show to show in the 80's. That's about the extent of my knowledge of the Dead's history
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