The truth about 9/11 can be hard to accept, but it is pretty obvious.
Truth about life can also be hard to face, but it is much more important than truth about any past event.
We can not change our past, but we can analyse it with our rational minds, learn from it, and thus change our life into something better... It is just evolution.
If you are a truth seeker, read what this book says :
http://www.truthcontest.com/entries/the-present-universal-truth/The present can transform us, and change this world into a peaceful place (where no shit like 9/11, or WW1&2 happens anymore) if it reachs enough people.
We are all brothers, and it is a big non-sense to kill each others. We just have to realize it, and this book helps a lot.