Incorrect.
Anthrax letters were mailed after 9/11, causing a few casualties. Al Fuqra associated Mohammad and Malvo killed many in their DC Sniper attacks. Richard Reid tried (and failed only due to diligent passengers) to blow up an airliner with his sneaker bomb.
That's three right off the top of my head.
You really aren't very bright, are ya?
All of those occured after the Patriot Act kicked in?