It made people pay attention. We are talking about it 9 years later so it must have had some profound effect on many of us. Can it be justified politcally perhaps not, but lives lost at the cost of a war not won can also be justified in personal ways. The whole ordeal is not quite over so we can't possibly see the big picture yet. I don't like to say the deaths of many innocent people can be justified but for me personally, I'll be sure they won't be for nothing.
Your question is philisophical in that can any death be justified?