From an article in TNR:

[John] Kerry remains furious about Tora Bora today. “They declared Osama bin Laden the world’s number-one criminal, and went out boldly proclaiming, ‘Wanted: Dead or Alive’ and talking about the dangers of Al Qaeda,” he told me recently. “And when they had an opportunity to completely, not only decapitate it, but probably to leave it with the minuscule, last portion of its tail, they never showed up.” His anger is justified. Bin Laden was clearly at Tora Bora, and sending so few troops was indeed a major failure.