WASHINGTON - North Korea’s threatening spate of missile launches — including an unsuccessful try with an advanced version of its Taepodong 2 Inter-Continental Ballistic Missile that is capable of hitting the United States — has sparked a cacophony of talk from leaders and foreign policy experts around the world. As they debate and discuss various options at the United Nations and in capitals around the globe, the rudimentary U.S. missile defense system is poised to shoot down anything launched from North Korea that threatens the American homeland or the critical interests of our regional allies like Japan and Australia. Noticeably...