I have this notion that other nations don't have business meddling in matters of sovereign nations - not because of perceived moral justification, certainly not to further their own interests, or because they suffer from the delusion of Manifest Destiny.
You're not the only one who has that notion.
But the 9/11 had plenty of results that could never be called positive. There were many people killed who, by no means, deserved it. Similarly, some people who did deserve it are still alive. As demonstrated by the hate crimes (murder) committed against Sikhs by ignorant Americans who thought that people with turbans are Muslim.
And the few Muslims that were victimized had
nothing to do with the 9/11. Ultimately, things like this are only destructive to both sides with no positive results. This world is on an unrelenting decline to its eventual end, which, whether near or far, is our only destiny.
Edit: Crud! I fell into the trap! This entire post is off topic! *shame*