I guess if a few friends and I decide to bomb some american building, the US will come to Puerto Rico and drop napalm till the whole island is brown.
I'm being cynical, but the point is: these people are not to blame for terrorist attacks, even if they are happy about the whole thing.
Thats the nature of terrorist attacks, you have to wage small, dirty war against them.
But the US public LOVES revenge and a good fight "GOOD VS EVIL!!" turns out, the world is not black and white.
My sympathy to the people and families who suffered during the attack, I was one who was left with no breath and still find it like a bad dream, but please, use common sense.
You kill them, and you will have more people to find in the ruble. And I'm talking about your own people in your own backyard.
Have a nice day.