They added insult to injury by using 9-11 as a pretext to put all American citizens under surveillance and to turn air travel into an unpleasant and aggravating experience. Airline passengers treated like criminal suspects where TSA agents bark orders at them to take off their shoes, throw away all liquids, go through x-ray machines, etc, etc.
Everyone responsible for this crime of the century needs to be brought to justice and severely punished in the most painful way possible. And that includes those who knew about the operation in advance and celebrated in the aftermath, like the "dancing Jews."