When I read it, it made a lot of sense. It is quite obvious if you look into it, that people's hallucinations or visions are strongly correlated with their current culture or world view. So you if you see something inexplicable, you are going to call it a ghost for example, but a medieval knight will call it a demon, but maybe someone from 2100 will call it a perturbation of the higgs-field or whatever makes sense then.
Quite interesting effect actually.
Western industrial society loves the states of consciousness that are good for doing work and making money. It's pretty friendly towards drunkenness. It grudgingly and indifferently tolerates the states that are good for making popular music. It is terrified of pretty much all the others.
I refuse to use the word 'psychosis' because it is so disparaging. The visionary state itself was indescribably wonderful. The physical effects of not eating or sleeping for the duration were bad, but temporary and fairly easy to fix. The subsequent reactions of others, including and especially so-called professionals, were devastating and made my life a living nightmare for about 9 months.
I'm currently reading Trials of the Visionary Mind by psychiatrist John Weir Perry. His views match my experience. I feel the stigma in Western society around non ordinary states is extremely damaging. It may be good for "the machine" or whatever you want to call it, but I know for sure it is very damaging to the lives of affected individuals, and I don't think it's good for society at large.
See:
http://en.wikipedia.org/wiki/James_Tilly_Matthews
http://en.wikipedia.org/wiki/On_the_Origin_of_the_%22Influen...