Wow, I can imagine that.
I remember I was still in the 5th grade. But I've done research last year about it and realized it did much more damage than the collapse of the WTC and the death of thousands of people.
It created an imaginary "we" (presumably America) and an imaginary "them", the terrorists. However, this was a contradiction in our own country because "them" terrorists also existed in America. Americans terrorized our own country within...so who exactly are "we"? Who does "we" include? It can't include just Americans because we know that there is interior terrorism plus the exterior. How do we divide or sort out the people who belong in the National Identity, if it even exists? I don't think we can.
So when you have that American flag as your avatar, it really doesn't mean anything in context. In this situation, it just means you support America (or not)...but it doesn't mean everyone in America supports their own country or even makes you part of America. Who is America? I doubt you can answer that question...I've put together a 10 page essay on this and referenced many scholarly journals...