OK the Satan Worship accusation might be taking it a little bit over the edge, but at the same time it was the late 60s/70s when LaVey started his Satanist Church.
I don’t think they were a hippy movement particularly, rather just one of many counter-cultural groups of the time who reveled rebelling against anything that normal society held as good and decent. I suspect most young ‘adults’ who joined these groups because they were tragically immature and and wanted to annoy their parents because they were having a prolonged period of adolescence.
Unfortunately, many of them never really grew out of it and even today haven’t ever completely grown up...
And let’s not forget about the Manson family cult types. Witchcraft and Satanism was considered “cool, dude” back then.
Imagine their surprise to grow up and discover that it was just stuckonstupid, typical leftie behavior....lol.