Just like I've posted recently in response to exactly this same issue. When the IRA (or any other terroristic organization) manages multiple organized strikes with combined deaths totalling in the thousands within as compressed a time frame as the strikes on 9-11, then and only then will you know how this type of tragedy feels as a people.

This is not meant in any way to belittle the attacks you mentioned, nor the internal struggles that lead to the tensions there. I feel for anyone anywhere who experiences such catastrophic tragedies, and indeed until the roots of these problems are dried up, the tree of global terrorism will continue to grow.

My earlier statement is only to point out that the same scale has yet to be experienced by anyone anywhere on the globe as what occured here on 9-11.