The main reason the Iraq war is so expensive is that the US refuses to massacre the suspected supporters of guerrilla operations. Thankfully, terror tactics are

The main reason the Iraq war is so expensive is that the US refuses to massacre the suspected supporters of guerrilla operations. Thankfully, terror tactics aren't accepted today as they were 500 years ago (or even 60 years ago). Say what you will of war crimes and illegal/immoral tactics today, but in the middle ages whole cities were leveled to root out enemies. The US would save billions by just killing the family of every suspected insurgent and blindly bombing their suspected locations.