I was going to write something here about 9/11, politicized tragedies, and how "never forget" is actually horrible advice, but... I'm tired. Yes, I can still tell you exactly where I was when the towers came down; but no, I don't think that's actually a good thing.
That's not meant as a dismissal of the event itself or the legitimate tragedy involved; it's just that if we're really going to "never forget" then we need to remember, in detail, all the evil we did in response and how that all unfolded. And somehow, none of the sorts of people who keep urging us to "never forget" seem to want to talk about that.
So, yeah: I'm tired. Let it go.