As spiritual leader of the terror group Hamas, he rose to challenge Yasser Arafat as the figurehead of Palestinian resistance to Israel When, in October 1997, the halfblind, almost wholly paralysed Sheikh Ahmed Yassin, who has been killed in an Israeli air strike at the age of around 67, arrived in Gaza, after being released from an Israeli jail in exchange for Mossad agents caught redhanded trying to assassinate a colleague in Jordan, one Arab commentator likened him to Nelson Mandela. The comparison must have made Yasser Arafat seethe inwardly, even as he heaped homage on the returning hero. In...