World Hunger easily. What's worse, being shot to death or slowly and painfully starving? And despite what some people may think, there are reasons that a lot of wars are fought, not wars like Vietnam or Iraq but think about revolutionary wars. They are fought often because of poor or tyrannical leadership. Without war it means that people would just get stomped on by the dictators without resistance.
Also you would never kill yourself in this scenario because then how would you know that Steve the magic gun actually went through with his promise for world peace and no starvation?
Also you would never kill yourself in this scenario because then how would you know that Steve the magic gun actually went through with his promise for world peace and no starvation?