THE sight of corrupt old Arab tyrants being toppled at the behest of a new generation of young idealists, inspired by democracy, united by Facebook and excited by the notion of opening up to a wider world, has thrilled observers everywhere. Those revolutions are still in full swing, albeit at different points in the cycle. In Tunisia and Egypt they are going the right way, with a hopeful new mood prevailing and free elections in the offing. In Libya, Syria and Yemen dictators are clinging on to power, with varying degrees of success. And in the Gulf monarchs are struggling to fend off demands for democracy with oil-funded largesse topped by modest and grudging political concessions.