They will find out who the perpetrators are and will punish them. As citizens of the United States, we need to trust our government. We must not allow the terrorists to win. They will win if they can generate hate. As I travel around the world, I find that people are more alike than different.
People are basically good.
It is human nature to be good. The evil acts committed by these terrorists defy human nature and even human comprehension. We must remember that these acts are designed to bring out the worst of human nature. It is designed to create anger and hatred. So long as our response is designed to punish only the guilty and to protect the innocent, then all us will come through this event stronger.