I remember Gary Haugen, the president of IJM (International Justice Mission: http://www.ijm.com/) talking about identifying bodies after the Rwandan genocide. He says "When people ask, where was God when this happened, it hit me. The real question isn't where was God, its where was God's people?"
With a few exceptions, Christians have failed in their part to bring God's healing to people in the world around them. While not all of us can be Mother Theresa, we can all do something to make God's kingdom of grace and mercy known in the world around us. I think the key to God's goodness in the midst of so many evils is us (at least those of us who call ouselves Christians)! We are the ambassador's of what God wants to do in the lives of people who are hurting and suffering. Maybe God's goodness is supposed to come through something you or I are supposed to do. When Christians decide not do anything about all that opposes God's kingdom in the world, they might as well not call themselves a Christian. A stagnant Christian is like a a cure for cancer in hiding...both are just ridiculous!
In the midst of all that one person can do, why is it we hear so much about what one person can't do. There are so many local, national and international organizations doing God's work (whether Christian based or not) that one person can find something they are passionate about and find a way to participate in bringing God's light to a dark world. My question is: What are you doing?