What are we supposed to remember about 9/11?

Asked by JLeslie (65447) September 10th, 2016 from iPhone

A friend of mine just posted on Facebook a link for a 9/11 video (that I did not watch) and posted “we have to remember.”

My question is remember what? We have to remember to honor the victims? Or, we have to remember to be able prevent it from happening again? When people say, “never forget,” regarding the Holocaust, they are saying we need to see the signs, and prevent it from happening again. Can we prevent another 9/11 by “remembering?”