The latest tempest in a teapot in Canada has been Prime Minster Paul Martin's long-delayed decision not to take part in the U.S. project for ballistic missile defense (BMD).Canada will share radar information about any incoming missile with the United States through the North American Aerospace Defense Command (NORAD), but it will not allow anti-missile interceptors on its soil (not that the U.S. wanted to put them there anyway), nor will it have any part in decisions to launch those weapons.That should have kept everybody happy. The U.S. gets the information it wants, while Canada withholds its formal approval of...