Where does this sentiment come from, the same as in the argument that the USA protects Europe? Do you really believe all countries would constantly try invade each other if they had less weapons? Citizens are not that eager to get killed on the battlefield, especially in developed notion with pretty good living standards at home. Maybe I am a bit idealistic but I just can not imagine the world falling apart if we had lesson weapons. I am not saying zero weapons, it is certainly not a bad idea to have some defense capabilities just in case, but being prepared to fight another world war seems over the top to me.