My heart sank,,,,,why is this world so cruel

Picking up the news of the ruthless child murderer few days ago really sent my heart and mind somewhere else. I can't think of any reason why the world has to be so cruel for one to live in and suffer. My heart and hands want to reach out but I feel so helpless, not knowing where and how to start. If I can, I would like to even go solo, to fight this sadistic crime that is taking place on our land.
This afternoon, picking up the latest news that the missing girl is indeed the victim of the ruthless beast, sank my even deeper and deeper into a state of chasm, an abyss, totally blank and helpless. What can I do? What can I do to help turn this land into a better place for our children?