Sometimes it takes a real bastard to make the tough choices and get things done. Norman Schwarztkopf described it as a fire in the belly. He declined to run for our nation's highest office because he didn't have it. On the plus side, I bet he never screwed around on his wife. You cannot reasonably expect a man to have the kind of passion and desire that it takes to be an effective leader without passion and desire for other things, too.
Any alpha male gets certain benefits for being the biggest and baddest.
Most notably, they get their choice of mates. It's nature's way of rewarding us for taking a strong, evolutionary lead. Otherwise, no one would take the job, and we'd all be running around naked trying to steal each other's bananas. Sure it would be great to have a leader who can keep it zipped. It just isn't likely.