It was not that he couldn't keep it in his pants. It was the WAY he did it. He couldn't have made a date with Lucy for the week after the wedding? He had to have her in his parent's house, flaunting it in front of his wife, with his entire family there? In front of his children?? Disgusting. How can that be the action of a man that experiences true guilt?

As for Generals and Commanders? Of course they're psychopaths. I'm sure that lots of CEOs are as well. Psychopathic tendencies don't necessarily mean that someone is what is more popularly known now as an anti-social personality, such as a serial killer. Sonny wasn't quite in that category, but he was far more ruthless than his charming exterior would allow.

And why shouldn't he have beat up Carlo? Because it led to his own death. By acting impulsively, out of bad temper, Sonny showed Barzini that he could be gotten to, and it worked, didn't it? He allowed his temper to get the better of him, a fatal mistake that Michael or Vito surely would never make.