His resignation seems to me, in any case, a fairly notable event, as these things go, and that is because, among the neoconservative intellectuals, Fukuyama has surely been the most imaginative, the most playful in his thinking and the most ambitious. Then again, something about his departure may express a larger mood among the political intellectuals just now, not only on the right. For in the zones of liberalism and the left, as well, any number of people have likewise stood up in these post-9/11 times to accuse their oldest comrades of letting down the cause, and doors have slammed, and The Nation magazine has renamed itself The Weekly Purge.

Nowadays, if you are any kind of political thinker at all, and you haven't issued a sweeping denunciation of your dearest friends, or haven't been hanged by them from a lamppost -- why, the spirit of the age has somehow passed you by.