It is natural to look for meaning in tragedy. History, myth, literature all represent means by which humans attempt to come to terms with the dark sides of our experience and to find something valuable in it, so that the tragedy was not for naught. The motivation is not simply to avoid similar tragedies in the future, but to give ourselves a sense that we understand what's going on, that all this isn't just a huge chaotic mess from which we will never be able to protect ourselves and our loved ones. We seek comfort as much as insight.
It is not natural, however, to fit tragedy into an ideological narrative. Ideology doesn't originate within us but arises from our acceptance of a narrow system of thought to which we attempt to conform. So complex events and nuanced actions must be shoved like a square peg into a round hole in order to validate the black and white ideological approach in our gray shaded lives. But we adopt ideological approaches for similar reasons: to give ourselves a sense that we can explain it all, that if we can just achieve the world prescribed by the ideology, such tragedy will never occur again.
The attack on Representative Giffords is now being portrayed by many as an outgrowth of the "climate of hate" surrounding conservative politics in general and the Tea Party movement in particular. The assassin would never have attacked this congresswoman, many claim, if there wasn't a poisonous undercurrent of anti-government sentiment. While an individual is responsible for his or her actions, we have a responsibility also to preserve a civil discourse and ensure that loose cannons do not employ our rhetoric in the service of violence.