Indebted to Younghusband at Coming Anarchy for pointing out this piece by Robert Kaplan in a recent issue of the American Interest:

Cut One:

It is obvious that a military can only fight well on behalf of a society in which it believes, and that a society which believes little is worth fighting for cannot, in the end, field an effective military. Obvious as this is, we seem to have forgotten it.

Cut Two:

When pleasure and convenience become values in and of themselves, false ends displace necessary means. It is as Sun-Tzu and Clausewitz said: While a good society should certainly never want to go to war, it must always be prepared to do so. But a society will not fight for what it believes, if all it believes is that it should never have to fight.

Cut Three:

“Decadence” is the essential condition of “a society which believes it has evolved to the point where it will never have to go to war.” By eliminating war as a possibility, “it has nothing left to fight and sacrifice for, and thus no longer wants to make a difference.”

There is a lot more, and some deep analysis.  Time well spent.