But that's the problem. He doesn't have the power to stop these things, necessarily. He gave us free will. It's not up to Him what people do in His name.
I don't know why people suffer. I wish I did. Sometimes it hurts so bad that you think the whole world is cracking in on itself and falling to pieces, that your heart can't take any more and you feel like you might implode.
But you keep on living. Because you have to. And you look for the good in the rest of the world, because it's all you can do.