This was written by Albert Camus in 1958. Algeria was in the process of throwing off French rule, and it was a bloody, vicious affair. I think much of what he says is relevant in our comtemporary clash with violent extremists. This article could easily be written today, substituting relevant names and events.
"When the fate of men and women of one's own blood is bound, directly or indirectly, to the articles one writes in the comfort of the study, one has a right to hesitate and to weigh the pros and cons. In my case, if I am aware that in criticizing the course of the rebellion I risk justifying the most brazen instigators of the Algerian drama, I never cease fearing that, by pointing out the long series of French mistakes, I may, without running any risk myself, provide an alibi for the insane criminal who may throw his bomb into an innocent crowd that includes my own family. I went so far as to admit this fact baldly in a recent declaration which was commented upon most strangely. But anyone who does not know the situation I am talking about can hardly judge of it. And if anyone, knowing it, still thinks heroically that one's brother must die rather than one's principles, I shall go no further than to admire him from a distance. I am not of his stamp.
This does not mean that principles have no meaning. An opposition of ideas is possible, even with weapons in hand, and it is only fair to recognize one's opponent's reasons even before defending oneself against him. But on both sides a reign of terror, as long as it lasts, changes the scale of values. When one's own family is in immediate danger of death, one may want to instill in one's family a feeling of greater generosity and fairness, as these articles clearly show; but (let there be no doubt about it!) one still feels a natural solidarity with the family in such mortal danger and hopes that it will survive at least and, by surviving, have a chance to show its fairness. If that is not honour or true justice, then I know nothing that is of any use in this world.
Only from such a position have we the right and the duty to state that military combat and repression have, on our side, taken on aspects that we cannot accept. Reprisals against civilian populations and the use of torture are crimes in which we are all involved. The fact that such things could take place among us is a humiliation we must henceforth face. Meanwhile, we must at least refuse to justify such methods, even on the score of efficacy. The moment they are justified, even indirectly, there are no more rules or values; all causes are equally good, and war without aims or laws sanctions the triumpth of nihilism. Willy-nilly, we go back in that case to the jungle where the sole principle is violence. Even those who are fed up with morality ought to realize that it is better to suffer certain injustices than to commit them even to win wars, and that such deeds do us more harm than a thousand underground forces on the enemy's side. When excuses are made, for instance, for those who do not hesitate to slaughter the innocent in Algeria or, in other places, to torture or to condone torture, are they not also incalculable errors since they may justify the very crimes we want to fight? And what is that efficacy whereby we manage to justify everything that is more injustifiable in our adversary?"
- Albert Camus, Resistance, Rebellion, and Death