I feel kind of odd here defending the morality of our capitalist overlords, but this 'crazy' or 'psychopath' angle might also be overplayed. At least we should not disregard the systemic angle. The way a manager behaves is also defined by things like 'success' (getting a good severance package) and 'belonging' (being able to host a party on one's yacht for the old boys). Of course it can be that these people really lack every last trace of empathy. But it can also be that they're just good at compartmentalising. The only judgement they'll really be confronted with is that of their family and friends, after all. And they are usually on the same yacht.

As for limited problem solving, people in companies are also more effective when they work in a team and to work in a team you need to be able to at least fake being a 'team player'. A sociopath can do that, an autist can't.