"Mental health is hard to study." is it? what is mental health? "I'm also very skeptical of people who think widespread use of psychedelics can make society b

"Mental health is hard to study." is it? what is mental health? "I'm also very skeptical of people who think widespread use of psychedelics can make society better. Lots of people used LSD in the 60s and 70s and as far as I can tell they didn't usher in a new age of love, peace, and tolerance." what was the control in this experiment?