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it's weird how tragedies on such large scales become cliche.

i've read several personal statements about the effects of hurricane katrina. i would say reactions to 9/11 are just as valid. if you have something compelling to say, just say it.

Yeah, don't be afraid to use it, just be tactful about it

Certain popular literature on the subject seems to indicate that it isn't a good idea.

agreed. unless you are a brilliant writer or someone in your immediate family was directly involved stay away from this for sure.

I would say unless you were:

a) at one of the sites when it happened or in the direct aftermath (helping)

or

b) made a major life change based on it (joined the military, etc.)

then you can probably find a better topic.

Even though you stated you merely want to mention it, I think this advice still holds. Why invoke it unless there is some unique connection; remember it is a personal statement.