It isn’t just depressing to bring death into the foreground of consciousness by creating an atmosphere of violence — it’s also dangerous. Any political arrangement that lets masses of people die thematizes death, by making lethal violence perceptible, frequent, salient, talked-about, and tolerated.
Just because our culture accepts the fact that some deaths have to be allowed to happen to preserve some freedoms doesn't mean that we "tolerate" lethal violence. No one is saying lethal violence is good or that we shouldn't discourage it in any way we can.