Taking in Zygote's scenario:
KKK attacks China, China decides to take military action. Then the KKK retreats back to America and as MOST un-lawful groups do, they dissolve into public background.
China wants them turned over. US answers "We feel sorry, we do not in anyway agree to this sort of action. We will do best to apprehend them OURSELVES and turn them over to you". Can the US government apprehend the scoundrels? Will[/i] the US government do so? China's not so sure. US and China aren't exactly 'close friends'.
Why, I'm sure Americans will be EXTREMELY amused when China declares war on US - "You shouldn't harbor terrorists". They decide to use direct military force despite the KKK scoundrels are within boundaries of US jurisdiction. Of course, this, no doubt is illegal. I'm very convinced such action will be criticized by every type of politicians, scholars, critics out there. Nobody can justify China in this course of action.
...
If it were the case of Middle East and US, as it looks like it would soon be, can US be justified when China in the imaginary scenario cannot?
I have lived in the states, I've been at most places that went down, I spent my whole young life there. America is like a second home to me, too. I sympathize, and despite that i'm an atheist, I still had to pray for the unfortunate, despite I didn't even know WHO I was praying to. It seems we lost some of our own business men in WTC, too.
But direct use of force, the "justice" you people are so sure of, can open new tragedies. Some might say "Its an acceptable risk". Pity. The moment other lives become 'acceptable risk', there is nothing which America can say that is different from the terrorist.
I sincerely hope America, despite wounds and deep sorrow, indeed show to the world that they can match what the highest ideals of their country stand for... and put a leash on all those oaths of "Vengeance" and "Blood".