>The war may seems invalid and unjust for nonAmericans who's country didn;t got through 9-11.

No, other countries went through things like that much earlier. My country had terrorist groups inserted into its territory, had an ambassador assasinated (in Sweden, 1972 or so), had a bomb set in a full movie theater in the middle of the federal capital, had a passenger plane explode at 10000m altitude (one survivor, a real miracle)... and nobody in the West gave a damn. Actually, I have a good reason to believe they actually gave... some funds to the perpetrators. Because we were a communist country, and thus regular criteria didn't apply?

So, as long as the West believed there can be good and bad terrorists, the terrorists had a more or less peaceful life, because they could simply be based on the good side of the border.

Now the receiving end of the club is pointing somewhere else, and all of a sudden terrorism is the greatest problem in the world. It existed in this form or other for unknown number of centuries. It existed in the last fifty years as well.