If you give them an inch they will take a mile. Failing to take strong action will encourage them. The longer they are around the more chance they have to do something else. They have proved that already. They bombed two American embassies in Africa and bombed the World Trade Centre before, and now they do this.
Military force is sometimes necessary to overcome evil.
I know that. In the last war, I parachuted over enemy lines on D-Day. These people have the potential to be worse than Hitler unless they are stopped. Knowing the Americans, they're going to sort this thing out. They're going to think it through and somehow go in.