> a bunch of stats saying psychopathy is apparently more common in business leaders and politicians

How do you know that being a business leader or politician doesn't induce psychopathy?

Furthermore, how do you objectively assess whether someone meets the threshold for being banned from a position of leadership?

If you're not opposed to watching anime, you might be interested in Psycho-Pass. It describes a future in which society persecutes people based on such assessments.