From your post, I can only assume you are either not from the USA or too young to remember 9/11? Regardless, your comments are incredibly naïve, very insensitive, and idiotic.
Move on from what exactly? Move on from remembering that we have a foreign enemy that wants to eradicate the Western world that continues to this day? Or should we move on from honoring the 3000+ lives lost and their families who's lives will never be the same? This event DID redefine this country. The events of that day changed the world, and will affect every generation from now on. Anyone who does not realize that or understand it, is an idiot.
That day also unified this country in a way that sadly will never be repeated. It's comments like yours that are part of the reason for the culture we live in today in this country. If you are a kid or not a citizen, I suppose your insensitivity and naiveté can be forgiven. If not, you should be embarrassed by your post because you are an idiot!