An interesting example I just found:
Hippism in the 60's, claiming for life in community, with absolute peace and love and so, found its dark opposite with the figure of Charles Manson who not only assassinated but also had plans to destroy the entire western civilization. He represented the darkest side of hippism and related it with dirty murders, crazyness and conspiracy plans.
Manson was the "proof" hippies could be "bad".
Now... ALL THAT was Thulsa-Doom and his cult.
The figure of Manson served to erradicate Hippism right after being born. It's shadow perdured during the 80's as the movie shows. It's not a surprise Milius never sympathized with Hippism (at least as a movement, though he and his surfer pals were strongly anti-system and actually very proto-punk). Milius always liked some cultural movements of the West coast like the music of THE DOORS (though is truth the Doors never were kind of "happy hippies")