It boils down to the inner struggle in each one of us between good and bad behaviour. Part of our personality is based on good, right behaviour, truth, and another part of our personality based on bad, wrong behaviour, lies. Everyone has both and our perception of self exists somewhere on the spectrum between the two. Between psychopath and saint.
I don’t know if you’ve ever seen this, but in the original Star Trek episode “The Enemy Within”, Kirk was split into two outwardly identical beings by transporter anomaly. One was calm, collected, wise, intelligent, empathetic, caring, and passive — and brave; the other was sociopathic, immoral, profane, and aggressive — and cowardly.
Easy choice, eh? Put the good Kirk in the chair, put the bad Kirk out to pasture.
However, it was clearly obvious that the good Kirk was as unfit for command as the bad Kirk. Roddenberry’s message was that the characteristics of decisive leadership that made Kirk an exemplary starship commander at a time of galactic turmoil (Klingons, Romulans, all enemies, then) came from his negative side; those characteristics were then tempered by the intelligence and empathy of his good side, resulting in the legendary commander.
An interesting illustration of the point you make; and one that Peterson seems to be attuned to, whilst others in society seems to believe the way to personal improvement is to kill off that “evil Kirk”, and turn us all into milquetoasts.