The war on terror was invented by the Feds. The purpose is to demand more money and power from people. So when the intelligence and Pentagon are there, the terror will be there too. If there is none, they create one.
Human have hound in their house to protect their family against the wolf. As the hound getting more power, they don't want to be guards any more. They want to be master. So the hound trained some wolf they captured. Let these agent wolf to attack and kill human. Human is frightened. They give hound whatever they demanded -money, power ..... Now hound become master. When they need something, they let the agent wolf have an attack on human, then said, this is a long war, to protect your lives, I need warrantless surveillance, more budget fund, torture prison..... The hound repeated its demand, "This enemy has struck us, and they will strike again, and we'll give our folks the tools necessary to protect the country," if you don't then the hound "can not protect ourselves".
That's why we saw after 10 years, occasionally a wolf or two were captured. But hundreds of thousands of innocent people died. There is an endless war to control people. A constant blackmail for more power.