From a Christian point of view of course we do want a peaceful world, and I think September 11 did actually make people aware not only of vulnerability and how transitory life is, but there are forces of good and honor and justice which speak to us of God and his love for us.
“Was there ever such stuff as great as part of Shakespeare? Only one must not say so! But what think you? - What? - Is there not sad stuff? What? - What?”