Weapons are for deterrence. but what if that same weapon that will guard its citizens points its gun at them.
War is the worst human pastime. And its worse if both opposing forces are shouting God while doing this evil actions.
Even in peacetime, people find time to hurt one another. From sports like soccer fans in Latin America, school bullies sometimes lead to school shootings and territorial claims by economic giants like China in the West Philippines Seas and Crimea occupied by Russian Forces.
War is preventable. But some people and leaders find them amusing when they abuse their power.