Wow you really think that the people you know would behave like that if it would be real? I think that would be pretty dumb to shoot everyone If it were real . As every Survivor could kill zombies. Which would lead to less zombies. People would even need to protect each other because while some would do farmwork the others would need to watch that no zombies come close. As you could not live for many years only from canned beans. Especially since they would run out pretty fast.