[pvarangot]

Dualistic thinking is so pervasive in the US that I think it's far fetched to say it's a token side-effect, as much as saying never speaking another language that is not English in your life if a token side-effect of psychedelic use... like the correlation is so big if you do self reported studies just in the US that it will be hard to deal with it.

Probably what's going on is that people just become more aware of dualistic thinking because of the extra open-mindedness or increase in empathy that forces one to somehow deal more with that "other side" that they are definitely "not a part of".