What has the enemy done to us that is much worse?
You mean the people who died in 9/11? Yes, that was an atrocious act: about 3,000 innocent American civilians died.
Or, are you referring to all of our American troops who have died? about 4500.
Or are you talking about the damage to our infrastructure and public safety? The destruction of three skyscrapers, various lasting health side effects, some severe, on rescue workers, marginal damage to the infrastructure of NYC. Contaminants in air and water cleared after a few days.
Okay, let's just say all of it. Now, multiple each of those numbers by 1000 and you will begin to scratch the surface of just how destructive this war has been for our "enemies."
I seriously doubt foreign enemies set the charges that brought down the towers.