Lots of collections have some token works, at least. He was the star pupil of Van Deren Coke, himself a superb printmaker. I'm merely addressing how the historic context tends to get glamorized when in fact it was something very ugly. I could mention a couple of famous rock stars from the same era and demographic circle who turned into monsters, way beyond general public knowledge. Charles Manson was just the tip of the iceberg; there were others who killed far more people,
either directly, or slowly through drug bondage. Lots of psychos and even serial killers around back then. The public never heard of some of them because they never went to trial, but straight to lifetime confinement in mental hospitals. If something seemed weird, it might have very well been weird, and it was best to keep your distance. That could at times be a life and death decision. And sicko visual content tended to attract sicko audiences. I was never part of the hippie or drug culture myself, but did have a front row view of it, so to speak.