Huh? No one talked of justification. I merely said that the US has committed far worse crimes and should refrain from doing so.
Dude. You are tripping over yourself. You just said this:
They are morally equivalent which is why we shouldn't do things like that which we continue to do.
Do you even know what moral equivalency means? Whether the United States government has ever engaged in bad acts is completely irrelevant to 9/11. The fact we illegally overthrew the Hawaiian monarchy has as much to do with 9/11 as some invented murder/torture in South America decades ago.
You are, in fact, trying to justify the murderous acts of terrorists on 9/11. Shame on you.