The stabbings, shootings, protests and clashes now spreading across Jerusalem, the West Bank, Gaza and Israel present one of the greatest challenges yet posed to the Palestinian president, Mahmoud Abbas, and his strategy of bilateral negotiations, diplomacy and security co-operation with Israel. The unrest – its proximate cause was increased restrictions on Palestinian access to al-Aqsa Mosque – reflects a sense among Palestinians that their leadership has failed, that national rights must be defended in defiance of their leaders if necessary, and that the Abbas era is coming to an end.