During his recent visit to Auschwitz, the Pope asked the question: "where was God during the holocaust? Why was he silent? Why did he allow places like Auschwitz to exist".
Jeff Jacoby has a pretty good answer to these (at first daunting) questions (emphasis added):
The answer, though the pope didn't say so clearly, is that a world in which God always intervened to prevent cruelty and violence would be a world without freedom -- and life without freedom would be meaningless. God endows human beings with the power to choose between good and evil. Some choose to help their neighbor; others choose to hurt him. There were those in Nazi Europe who herded Jews into gas chambers. And there were those who risked their lives to hide Jews from the Gestapo.
The God ``who spoke on Sinai" was not addressing himself to angels or robots who could do no wrong even if they wanted to. He was speaking to real people with real choices to make, and real consequences that flow from those choices. Auschwitz wasn't God's fault. He didn't build the place. And only by changing those who did build it from free moral agents into puppets could he have stopped them from committing their horrific crimes.
It was not God who failed during the Holocaust or in the Gulag, or on 9/11, or in Bosnia. It is not God who fails when human beings do barbaric things to other human beings. Auschwitz is not what happens when the God who says ``Thou shalt not murder" and ``Thou shalt love thy neighbor as thyself" is silent. It is what happens when men and women refuse to listen.