[shoes_for_thee]

I'm not sure I understand your question, or assertion...

Mystical experiences change beliefs, ideology, and alter the way we interpret reality in the long-term. Whether or not those beliefs exist in the physical brain, is, I guess, an open question.

All that said, I'm not entirely convinced that mystical experiences are particularly beneficial. I suspect that the changes in beliefs they engender can indeed be malignant.

But then again, I also low-key suspect that LSD was popularized by the CIA among hippies in the 60s in order to destabilize and undermine the anti-war movement, replacing activism with pointless psychedelia and the search for ultimate reality, mannn.