Bad things happen.
Is it so that in all things, there is a purpose?
I would guess that a sage of the very highest level of sagery will see purpose in every act of man. For the rest of us, there are things that will remain irredeemable.
When we are in that place of despair in the aftermath of unthinkable acts, without answers, as there is no sense to senselessness, we have something more than hope. We have opportunity. Always. Even when we cannot imagine how there could be. It may take courage to find that light within and let it guide us. I promise you, it is there and it will.