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.
The problem with leaderless uprisings taking over is that you don't always know what you get at the other end. If you are not careful you could replace a bad government with one much worse!
