Obviously, the person to blame is the one who pulled the trigger. If, as all evidence suggests, that man was Jared Lee Loughner, then it is perfectly clear that the man to blame is a deeply disturbed, mentally ill, deranged individual who -- in my book at least -- knew what he was doing and knew that it was wrong. And that is all that is required to defeat an insanity plea and establish his responsibility.
He deserves a vigorous defense.
And if, as the evidence suggests, he is guilty, he deserves the ultimate penalty.
Sarah Palin also made a statement, including this: "Acts of monstrous criminality stand on their own. They begin and end with the criminals who commit them, not collectively with all the citizens of a state...."