DJERBA, Tunisia — The idealism of the revolts in Egypt and Tunisia, where the power of the street revealed the frailty of authority, revived an Arab world anticipating change. But Libya’s unfinished revolution, as inspiring as it is unsettling, illustrates how perilous that change has become as it unfolds in this phase of the Arab Spring.

Though the rebels’ flag has gone up in Tripoli, their leadership is fractured and opaque; the intentions and influence of Islamists in their ranks are uncertain; Col. Muammar el-Qaddafi remains at large in a flight reminiscent of Saddam Hussein’s; and foreigners have been involved in the fight in the kind of intervention that has long been toxic to the Arab world.

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