12 billion is a very small amount compared to the overall headline cost. Weapons and logistics is money that goes back into the US economy. Your other points a

12 billion is a very small amount compared to the overall headline cost. Weapons and logistics is money that goes back into the US economy. Your other points are also 'limited impact' (if not small impact, frankly) in the grand scheme of things... In any case, lest we forget: the invasion of Iraq has nothing to do with 9/11.