Quote from : Ender's Shadow Book

The Buggers have finally, finally learned that we humans value each and every individual human life... But they've learned this lesson just in time for it to be hopelessly wrong—for we humans do, when the cause is sufficient, spend our own lives. We throw ourselves onto the grenade to save our buddies in the foxhole. We rise out of the trenches and charge the entrenched enemy and die like maggots under a blowtorch. We strap bombs on our bodies and blow ourselves up in the midst of our enemies. We are, when the cause is sufficient, insane.