This whole missile defence system is idiotic, and unsafe. Canada will not put up a defence system that would harm the people if it is not fail safe, and even so, radiation effects from the missiles that float around the atmosphere can cause serious environmental effects.
The thing is, why should we help fight a war that we are not in?
About the justifying cause of Nagasaki and Hiroshima.
Both these cities were strategic naval ports for the war. With this A-Bomb technology, the Allies had the upper hand in the war. By eliminating these ports it hurts the Japanese navy, and boasts the strength of the Allies. No one knew what damage these bombs could have done, or the long term affects from these bombings, that still occur in these places. After the destruction of these cities, the Japanese had no other choice than to surrender.