The Leader is a man of about 40, with a smooth, youthful face and a thin beard and mustache. In televised speeches, he wears a blazer with a shawl over his shoulders, his dark eyes menacing and humorless. Apart from that, so little is known about him that he might as well be a phantom. He has no birth certificate or passport and is said to have spent his formative years living in caves. No foreign diplomat has ever met him in person. He presides over a starving, brutalized people in northern Yemen and has sent an armada of child soldiers to their deaths. In January, one of his courts condemned nine men to be executed for homosexual behavior—seven by stoning, two by crucifixion. Yet Abdulmalik al-Houthi may now be the most popular public figure in the Middle East. Ever since his soldiers began attacking and boarding commercial ships in the Red Sea in November—ostensibly in defense of Palestine—he has been treated like a latter-day Che Guevara, his portrait and speeches shared on social media …