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Usually, yeah. Which is a very dumb reason, since there aren't any resources you can find on Earth you can't find in space (and get them more easily). That's bad writing 101 right there. Unless they've come for the cows.
But most movies at least give you a reason, even if it's a very dumb one like Independence Day, or the dumbest I've ever seen, Cowboys and Aliens.
I never got around to seeing Cowboys & Aliens. But with Independence Day, they actually want to live on the planet. Then they will leave and go elsewhere when Earth eventually becomes inhabitable. Much like us, there are probably only a limited number of worlds they can survive easily on.


