The fall of Moammar Gaddafi ends the rule of one of the most mercurial and menacing figures in recent history — the “mad dog” sponsor of international terrorism who allied himself with the George W. Bush administration’s war on terror; the pan-Arabist who at one time or another alienated nearly all of his Arab brethren; and the self-styled revolutionary philosopher who, in the end, was just another violent dictator clinging to power. With his trademark sunglasses, flowing robes and jut-jawed insouciance, Col.