The context is that once the terrorists made sure that everyone's greatest sacrifice and efforts are in vain by brainwashing and manipulating everyone to walk into the beacon of light, the spectacle known as the silent death of modern society will happen, and even as the killers are TAKEN DOWN AND EVISCERATED, you will still spend the rest of your life falling in despair, never to stand straight again.
(There is a reason why the "Future Arc" is actually the aftermath where everyone is insane and desperate from their lamentations and failures, and there's a reason why it came to be despite nobody asked for it or imagined it in the Despair arc)
OK, i am playing it bro