Giffords can only get a few words out — "so slowly" — and Diane Sawyer has no compunction about supplying words all around Giffords's words, most notably at the end of the interview — you have to watch the video — when she turns Giffords into a puppet who voices the last word to a long sentence yammered out by Sawyer. Sawyer repeatedly assures us that Giffords understands everything and is able to think well, that her only intellectual deficit is in speaking. We're told how effective Giffords will be in pressuring Congress to enact gun control. She will be taken around to the members of Congress so they will be subjected to the ordeal — if they want to say "no" — of saying "no" to her face.
This is how it's done. At what point do you say "no"... enough?
ADDED: The most poignantly telling moment in the interview is when Giffords is invited to say what matters most to her. She says: "family."