A fairly untenable position for a NASA chief, but typical for an organization rife with politics and a CYA mentality.
In his defense, he was wracked with emotion that day. I am sure he would have taken back the words if he could. It was just before the memorial and it was a sensitive area for them. Kinda like "what did you know and when did you know it?"
It was in retrospect, a dumb thing to say, but he is now way close to a polititian.