We’re continuously confronted with acts of violence that are at once shocking and simply unimaginable. Often, we flounder for what it is we should be feeling. Sometimes we’re surprised by our delayed reaction when our emotions—anger, outrage, disbelief, contempt— finally bubble to the surface. Yet at the far reach of our bewilderment, we find our emotional identity with what’s happened. This is collateral grief, our most fundamental response to the pain and suffering of others, expressed as heartfelt compassion.