What this teaches us is that tolerance, viewed as a moral absolute, amounts to renouncing the right to self-protection; but viewed as a peace treaty, it can be the basis of a stable society. Its protections extend only to those who would uphold it in turn. To withdraw those protections from those who would destroy it does not violate its moral principles; it is fundamental to them, because without this enforcement, the treaty would collapse. It is appropriate, even ethical, to answer force with proportional force, when that force is required to restore a just peace. We seek peace because on the whole it is far better than war; but as history has taught us, not every peace is better than the war it prevents.