@Smokin Joe
Why are humans around the world trying to kill other humans around the world?
It has been thus since Cain. The same fundamental motives, pride, greed, lust, envy, gluttony, wrath and sloth, appear in one form or another, or in concert, whether on the basis of just the leaders, or whole nations.
What I propose is more a deterrent than a weapon, although it could be the latter. Should potential enemies develop such to the point where it gave them a significant advantage, they will likely use that advantage to conquer.