Although it is commonly supposed that war making is the specific activity of nations, the blind rage that motivates war destroys the very social bond… - Judith Butler

When the world fails us, when we ourselves become worldless in the social sense, the body suffers and shows its precarity; that mode of demonstrating precarity is itself, or carries with it, a political demand and even an expression of outrage. To be a body differentially exposed to harm or to death is precisely to exhibit a form of precarity, but also to suffer a form of inequality that is unjust. So, the situation of many populations who are increasingly subject to unlivable precarity raises for us the question of global obligations. If we ask why any of us should care about those who suffer at a distance from us, the answer is not to be found in paternalistic justifications, but in the fact that we inhabit the world together in relations of interdependency. Our fates are, as it were, given over to one another.

To say that a life is grievable is to claim that a life, even before it is lost, is, or will be, worthy of being grieved on the occasion of its loss; the life has value in relation to mortality. One treats a person differently if one brings the sense of the grievability of the other to one’s ethical bearing toward the other. If an other’s loss would register as a loss, would be marked and mourned, and if the prospect of loss is feared, and precautions are thus taken to safeguard that life from harm or destruction, then our very ability to value and safeguard a life depends upon an ongoing sense of its grievability—the conjectured future of a life as an indefinite potential that would be mourned were it cut short or lost.

Lives matter in the sense that they assume physical form within the sphere of appearance; lives matter because they are to be valued equally.