I was bored yesterday, and so I watched Independence Day. Again. And at one point a character said that within 36 hours the aliens would destroy every major city. Which meant the human race would be exterminated.
Hello! What about the rural people? For the rural people getting rid of the cities would be an improvement. We give them the farm goods that keep them alive, and they give us drug dealers, taxes and laws that limit our ability to make a living. In other words, they give us liberals.
Well, I guess the aliens could use their visually cool explosions to kill the rural people like they killed the city folk. But rural folk are more spread out. They would have to explode us house by house, and each explosion would damage more of the Earth.
The aliens want the Earth for something. That’s a big, expensive space fleet they have. Why expend it— risk it— if they didn’t care whether they conquered Earth or not?
The aliens are somewhat like humans, so they need food to live. Where will they get it if they blow up all the farms? They would be better off enslaving all the farmers and taking their produce, or else driving the farmers off their farms and replacing them with alien farmers.
Each alien explosion drives up more stuff into the atmosphere. Their explosions aren’t nuclear, but they could cause a nuclear winter all the same— after all, a massive volcanic explosion once caused a ‘year without a summer,’ and may have caused US westward migration and affected the history of the Mormon church.
Would the aliens really want a world that is all ashes and suffering unseasonable coldness? Which would be made worse if solar cycle theory of Global Warming is true— the theory says we are at the end of a warm cycle and the start of a cool cycle. See ‘Dark Winter’ by John L. Casey.
I would say that enslavement is a far more likely fate for rural humans than extermination, when the aliens arrive. After all, the aliens have a motivation. They are not just conquering Earth for the hell of it. They want to use the Earth, not ruin it, and why wouldn’t they use the surviving humans if they had to avoid killing them to keep the planet useful? Human beings are concentrated in cities. Without the city folk or military bases, the rural population would be easy to control.
The writer’s lesson is this: if you are going to have an external force destroy or threaten the Earth, think about the external force’s motivation. What do they want? How will they preserve the things they want about Earth while conquering it? You can’t just say that since they are aliens we can’t understand their motivations. In a real world alien invasion, humans may never know all the details of what the aliens want, unless they tell us helpful hints like how they want humans to die. But we can surmise from what they do. If they destroy mineral mines, they may not care about exploiting our mineral wealth. If they destroy our atmosphere, they aren’t planning to breathe here. If they spare certain things— farms, exotic African animals, meek-and-obedient humans— we can guess that they want these things for some purpose.