YMBSM!
She continually whined and cried about how afraid she was, to anyone who would listen. They tried to blame several incidents on conservatives, but never any arrests. Her dear friend in CD7 even had "someone" sending him white fake anthrax powder to get the sympathy vote.
It was Giffords' responsibility to provide a safe environment that day, like there always was at the tea parties and at any indoor political events. She could have requested a deputy from Dupnik, or hired her own guard. Especially given how afraid she was of the tea party and ANY and all opposition to her fascism.