Society needs people willing to make taboo tradeoffs and take risks with no hesitation and occasionally hurt or manipulate people.

You don't need psychopaths to get that. And of the people actually willing to make taboo tradeoffs, take risks and hurt or manipulate people it isn't the psychopaths who are most likely to do so in a way that benefits 'society' as opposed to themselves at the expense of society.

Big companies need silver-tongued managers with more than a dash of cleverness and ruthlessness.

Society doesn't need that, I don't need that. Big companies are better for psychopaths than psychopaths are for big companies. And once again it isn't 'society' that benefits and nor is it me that benefits so I reject your 'we want people with a large amount of psychopathic traits' claim.

Armies need cannon fodder.

Psychopaths are going to volunteer? Or are we rounding them up and sending them to the front lines? (I'm all for this.)

Storytellers don't need, but would benefit from, some real examples of magnificent bastards and an audience that can empathize with such.

We need(/want) <terrible thing> because we are in the habit of telling stories about <terrible thing>. No thanks.