We must do something.

For a start: we know the places where they rejoiced and danced in the streets in celebration of the falling of the towers. Those streets and all their buildings should become monuments: not one stone stands upon another. Level the rubble so that a troop of cavalry could ride across where they stood and not one horse stumble. Then sow salt on those grounds. They will be left as monuments, visible from the air, visible from space: monuments to dead Americans.

It's not a very well organized [link|http://www.jerrypournelle.com/war/whattodo.html#One|page], but it is some interesting speculation about things to do.