It took me all of two seconds to commit that date to memory, because I was in the building at the time. I waited for 8 long years for something to be done about this attack on US soil, and then the inevitable result of doing nothing happened.
That fact does not make your opinion any more legitimate than others who are also informed about current events. I know someone whose father got out of one of the buildings on 9/11. This person doesn't think we did the right thing in going into Iraq. There are other 9/11 survivors who also feel the same way. Do their opinions trump yours because they survived an even bigger attack than the one you did? Of course not. The breakdown of opinion among survivors is probably in sync witht the general population.