Jerry Jones is an ass and has been since day one. At least his management and football skills are slightly better than the utterly incompetent Daniel Snyder.
Clint Murchison didn't pretend to know how to run or field a team - but he hired people who did.
You cannot argue with his success.
I wouldn't call him an ass. He just has an ego that exceeds his accomplishments.
Snyder's problem is that he's willing to throw too much money at players simply because he's heard of them before. Joe Gibbs has done a decent job at restraining those tendencies, though.