Grey vs. black. Or grey vs. grey?
It should be obvious that to someone like me, who apparently wants to drag the western world kicking and screaming into the 13th century, the United States and the Deranged Islamofascist conspirators are both mottled grey, and that the Islamofascists even have a few patches that are paler than the corresponding patches on the Great Satan.
But I am fortunate in that I am not forced to make such a choice, because this is only an existential conflict for the Islamofascists, and the dynamics of global hegemony are such that they will inevitably be bombed and Coca-colonised out of existence. Similarly, the Pope is not forced to make a choice, and can afford to indulge in pious platitudes against war, knowing his words are not going to have any bearing on the outcome. It is not like Spain in the 30's, when the Church had the potential to determine which of two equally powerful and very dark grey movements would prevail. Yes, we are very lucky. Powerless, but lucky.
Given that there is no existential threat to the West, there is no analogy to the stark choice facing the U.S. liberals addressed by Koestler. There is no need for such people to abandon long-term principles to defeat a non-existential threat. If you are someone who sincerely believes that Bush is leading the world towards tyranny, then you should not care if Al-Qaeda appear to be a bit darker grey than the military-industrial complex. The military-industrial complex does not need your help to squash them. The 'war on terror' may be a little longer, and more unpleasant for frontline countries like Israel (and perhaps the one or two American cities taken out by terrorist nukes) because of your liberal efforts, but if the resulting Orbis Americanis is a kinder, gentler one, it will be an acceptable sacrifice.