Better a theoretically justifiable materialist solution with dubious results than a non-quantifiable solution that actually works.
"What would Schopenhauer's philosophy have been like had he experienced the mind-expanding effects of naturally occurring DMT?"
Proposition 1: The unexamined life is not worth living.
Proposition 2: Psychedelics provide us with an unrivaled means to examine life.
Conclusion: Psychedelic plants are an indispensable part of every philosopher's tool chest.