Some people will never forget what terrorists did to this country. It has forever changed their lives. President John McCain is one of those people who will never forget!
Others (perhaps you or other cynical people) would rather forget not realizing doing so will ensure an even greater attack.
Who saying we should forget?
I'm saying that after 911 the Congress rushed through bad legislation (most didn't even read or have time to read the Patriot Act) and that has not served us well.