>>People totally blind from birth taking hallucinogens don't see entities

So these people do not trip at all on hallucinogens? Sounds like rather improbable. ~70% of what you call "visual experience" is driven by non-visual cortices, like anterior cingulate, for example. And even before the visual cortex, even on the thalamus level, the thalamus receives up to ~60% of top-down connections from non-visual cortices. You do not need to literally see anything in order to get the information about it. Get your potato, monkey.