"White House staff members claimed that Bush remained with the children so as not to "upset" or "alarm" them.
This is a truly bewildering excuse. If the country was under attack, Bush might be forgiven for upsetting a few schoolkids. If the President's life was in danger, then so was the life of every little child in that room. At the time, fighter jets had been dispatched to defend New York City. But according to one of the fighter pilots, it would have done no good to catch up to one of the hijacked planes before it landed in a murderous explosion at the next population center. The only person with the authority to order the plane to be shot down, noted the pilot, was the President, who was still reading to schoolchildren."
--Eric Alterman, Attribution
http://thenation.com/doc.mhtml?i=20031006&s=alterman