On the other hand, I think the risk of the US to the world is greater (far greater) than the risk of the world to the US.
The US is in no danger of being attacked or invaded by anyone; one cannot say the same about other countries with respect to the US.
Even something as substantial as 9/11 was only a crime - a monstrous crime - but certainly not an act of war. There isn't any actor with the capability or will to do any serious damage to the US that wouldn't be annihilated by nuclear retribution; the US's security derives from its obvious and plain-sight strengths, not anything it keeps secret.
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On the other hand, I think the risk of the US to the world is greater (far greater) than the risk of the world to the US.
The US is in no danger of being attacked or invaded by anyone; one cannot say the same about other countries with respect to the US.
Even something as substantial as 9/11 was only a crime - a monstrous crime - but certainly not an act of war. There isn't any actor with the capability or will to do any serious damage to the US that wouldn't be annihilated by nuclear retribution; the US's security derives from its obvious and plain-sight strengths, not anything it keeps secret.