i kinda agree that the winnowing processes for leadership sometimes result in deficient characters making it to the top.
but the way i read the article, 3% of business people exhibit psychopathic behaviours.
and their definition of psychopathy sounds an awful lot like ruthless ambition.
i think a lot of leaders are ruthlessly ambitious and/or extremely vain. and this explains some issues.
but i am not so clear that ambition and/or vanity necessarily makes all of their decision-making awful.
and as you know, i tend to see the world as full of structural issues which create monsters out of normal people; rather than a surfeit of monsters in a world which leaves them free to act as they wish.