Here’s Rick Raznikov’s answer:
“Freedom” was not attacked on September 11, 2001. It was two towers in New York and, apparently, the Pentagon. It had nothing whatever to do with freedom.
On the other hand, America’s freedom has been under attack ever since, mostly by the U.S. government.
One does not defend freedom by wiping out amendments to the Bill of Rights, kidnapping citizens and holding them without trial, torturing thousands and holding them in prisons without habeas corpus, and conducting warrantless wiretapping and unrestricted electronic surveillance of an entire citizenry. That is how one attacks freedom.