As far as the Yanks are concerned, 9/11 was far worse, not because of the actual event that happened, which was minimal compared to what’s actually happened in Iraq, but because all those highly-paid agents in the security services never saw this coming and were made to look like a complete bunch of muppets.
They probably never got over the embarrassment and loss of face at getting suckered like that, so someone had to pay. If all those ‘special agents’ had spent more time in doing their jobs properly instead of sitting around stuffing their faces with Big Macs and drinking coffee, who knows, they might have prevented the whole episode. Just a thought!