The relevance for 9/11 is that what 9/11 marked was the beginning of a struggle in which the terrorists come at us and strike us here on our home territory. And it's a global operation. It doesn't know national boundaries or national borders. ↗
When news of the crash came, probably a lot of people in small towns and farms across America felt a sense of grim satisfaction that the sinners had finally been punished for their wicked ways. ↗