Most cultures have some form of mystical experience. People outside of that culture generally assume that the experiences of yogis, mullahs, vodun priests, santeros, etc. are not real evidence of the supernatural. Research into such phenomena has been conducted for centuries, with no sign that there is any not-natural explanation.
When a "mystical experience" is indistinguishable to the observer from a lie, a mistake, a common brain phenomena or some form of insanity, why assume that the mystical explanation --the one with the least evidence-- is the real one