I think that we all have a dark side, or a 'shadow' in Jung's terminology, and it's very important to become aware of that part of ourselves and have that as an ally. In mythology, when Perseus fought the Medusa, he didn't destroy her completely, he actually beheaded her and carried her head as a tool for himself.
On a similar note but not exactly, Gurdjieff has a quote which I love and think is very relevant: " In order to be a true altruist, one must first learn to be a conscious egoist " (or consciously selfish).
So say for example even posting this here, there's a lot going on behind my intentions. On one level I'm trying to contribute to the discussion, answer you, help out. But there are other levels too, maybe part of it is my ego, which wants to 'show off', or something like that. Or maybe there's also a self-centered 'desire to belong' ,which may or may not be related with survival instincts we acquired from our past where not belonging to a group was a death sentence.
I think more often than not these two (or multiple) sides come together in the different things we do. I think that it's important that we do not deny or repress such 'negative' part of ourselves otherwise it just comes out in an uncontrolled fashion elsewhere. I think self-observation is a key, try to observe the different impulses, accept them and deal with them, and manage the best way possible.
And when adding psychedelics to the mix, its likely that this will be even further potentiated, all the different sides can come out, and we see all these different parts of ourselves (and others). It's a great learning experience, and realizing we have a dark side should not be seen as a negative thing but a very important part of our path to self-knowledge and becoming better people.
Not sure if this is exactly the kind of answer you were looking for but it's what came to my mind
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