To those saying that Americans should "stfu and get over" 9/11. I'm curious, do you think the Japanese should "stfu and get over" the bombings in Nagasaki and Hiroshima[1]? They have a park to symbolize what happened, and every year memorialize those events. I don't live in Japan so I can't say if it is still as large a rememberance as 9/11 is to Americans toady. But it is much more recent to us. 50 years from now, when the majority of people alive on 9/11 has passed on, it will become more like Perl Harbor is today, where there are only a few left who were alive when it happened, and there are smaller ceremonies, and for most it is a date on a calendar that they might think of for a few moments, and then move on with life. 150 years from now it will be more like the Battle at Gettysburg: taught about in history books, remembered primarily because someone gave a nice speech about it (4 months after it happened), but for most people a date like any other.
But you can't deny that it was a major event in lives of the American people today. If you don't care, hey, whatever. But don't be so callous to other people's feelings. I wouldn't begrudge Japanese for marking important dates in their history, I wouldn't begrudge British people for marking the subway bombings. I won't tell you how to live. But I expect the same courtesy from you.
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[1] Yes, I recognize the irony of an American using this as a counterexample, but I also recognize the extreme impact that would have on a people. Something some of our international friends on this forum apparently don't.