Nearly everything our government did in response to 9/11 was harmful and ineffective. Airport security is still insecure (shoes screened but cargo not), but travel by air has become a nightmare for millions and airlines are in financial distress. Federal spending and deficits have soared. Vast new bureaucracies have been created. National ID cards and other intrusions have been created, one after another.
And we are no safer than before, neither will we be, because so-called government solutions for anything are nearly always incompetent and destructive, because terrorists, kind of like evil entrepreneurs, will always be quicker and smarter than big governments.