This is totally true, not sure why it's downvoted. Psychedelic enthusiasts will often say "oh well that person who had a bad experience was predisposed and shouldn't have taken it." When there was literally no way of telling that the person was predisposed until they took the drug. You can be a fairly stable person but be predisposed to psychosis when you take psychedelic, but have no idea that's the case until you take the psychedelics. Maybe you family history is clear because nobody experimented with psychedelics and thus never triggered that predisposition, or maybe you just don't learn about every instance of psychosis in your family tree. If you try to bring this up to psychedelic enthusiasts they get defensive even though they're obviously in the wrong.