In no way shape or form were any of the victims doing anything to harm anyone.
Giffords and Roll: how were they paid? Do you know where their salaries came from? One group of people, or its delegates, put them in office over the protests of another group of people, yet the second group of people is still extorted by the State to pay their salaries.
Completely ignoring any and all other offenses they may have committed while in office, that right there qualifies as doing something to harm someone. Extortion is a crime. (When the government does it, it's called taxation rather than extortion, but it's still an initiation of force, therefore a crime.)
"But whether the Constitution really be one thing, or another, this much is certain--that it has either authorized such a government as we have had, or has been powerless to prevent it. In either case, it is unfit to exist." --Lysander Spooner, 1867
