On Sep. 11, 2001, al Qaeda terrorists flew hijacked airliners into the World Trade Center and the Pentagon, killing nearly 3,000 people from many nations, including 24 Canadians. On the 25th anniversary, the people might recall the U.S. agency that failed to stop the worst attack on the United States since Pearl Harbor in 1941. “At the CIA, our mission is to preempt threats and further U.S. national security objectives,” claims the secretive age…