I wish he could've elaborated about this piece of writing. Does he mean all the people who took acid in the 60s are all burnouts? If one out of every ten people who dropped acid had an enriching experience and the rest got severe mental illness does that mean the acid movement failed?

As for the 'old-mystic fallacy' of acid, there are people who actually got enlightened from the stuff without having to spend ten years meditating in a monastery. As McKenna said: 'but the ferry costs a nickel'