The loss of these wonderful people should make every one of us strive to be better in our private lives – to be better friends and neighbors, co-workers and parents. And if, as has been discussed in recent days, their deaths help usher in more civility in our public discourse, let’s remember that it is not because a simple lack of civility caused this tragedy, but rather because only a more civil and honest public discourse can help us face up to our challenges as a nation, in a way that would make them proud. It should be because we want to live up to the example of public servants like John Roll and Gabby Giffords, who knew first and foremost that we are all Americans, and that we can question each other’s ideas without questioning each other’s love of country, and that our task, working together, is to constantly widen the circle of our concern so that we bequeath the American dream to future generations.