My impression of the 60’s revolution was that it was greatly fuled by psychedelic „drugs“ like Marijuana, LSD and holy mushrooms (psilocybin/psilocin).
In this context a lot of conventional cultural, political, spiritual and philosophical concepts were questioned and attempted to revolutionize.
The powers of that time were not stupid and quickly realized the connection between „drugs“ and the changing consciousness towards conventional society.
The powers realized the only way to stop the questioning of their power/system was to criminalze psychedelic „drugs“.
So they did.