I'm sorry for the loss of life of the people who died in the attacks, but some of the things that America has done since using the WTC attacks as justification are rather unforgivable. 92,000 civilian deaths in Iraq, and a few thousand for every year in Afghanistan, as a result of Americas actions somewhat tarnishes the whole affair.
Wheres the memorial services for the Iraqi and Afghan civilians who have lost their lives? Oh yeah, there isnt any, because apparently a couple thousand American civilian lives are vastly more important than a hundred thousand foreign civilians lives.
but of course, they kinda have to blow it out of all porportion, and etch the event in the minds of every one of their citizens, so that they continue to think that Americas foreign actions are justified and continue to support and fund their military.