Are Generals psychopaths? Captains? Commanders?
Santino had a job to do, and that job was to win, goddamn it!
Sure Santino beat up Carlo! Who wouldn't? The guy was a skeezer, a scumbag who beats up women (and probably children, if nobody's looking).
Sure he hit Bruno Tattaglia, it was a war.
Sure he ordered the murder of Paulie Gatto - the man set up his father to be killed.
I mean, c'mon. Santino had plenty of provokions (if that's not a real word, it ought to be).
His one true fault is that he can't keep his donkey in his pants. But that doesn't make him a psychopath. A bad husband, maybe.