Warren asked Obama: "Does evil exist, and if it does, do we ignore it, do we negotiate with it, do we contain it, or do we defeat it?"
Obama's response: "Evil does exist. I mean, we see evil all the time. We see evil in Darfur. We see evil in parents have viciously abused their children and I think it has to be confronted. It has to be confronted squarely and one of the things that I strongly believe is that, you know, we are not going to, as individuals, be able to erase evil from the world...Now, the one thing that I think is very important for us is to have humility in how we approach the issue of confronting evil, but, you know, a lot of evil has been perpetrated based on the claim that we were trying to confront evil...And I think one thing that's very important is having some humility in recognizing that, you know, just because we think our intentions are good doesn't always mean that we're going to be doing good..."