Are you prepared to use nukes?

Interesting article by Edward Luttwak in the Telegraph. The key paragraph is this:

Long ago, Karl von Clausewitz, the supreme theoretician of war, explained why every attempt to prettify its essential violence with inconsistent acts of moderation, every refusal to use maximum force when it can be purposeful and no mere rampage, adds to the human costs of war by extending its cruelties and deprivations, and even more by delaying the arrival of the desired peace that is the only possible goal of any rational war.

I am impressed he's managed to read Clausewitz. But the real point here is about how much violence you are prepared to use. Are we prepared to use nukes? Personally, I think that question is not a bad litmus test for war. If you are not prepared to use nukes, don't fight.