What would they want from us?
Reproduced with author's permission ;-P
"I don't give two shits for humanity just now," Steve shouted. He calmed down. "Besides. Currently Mars and the asteroids are being strip-mined. How long do you think that will take? I'll tell you - about 200 years. Then Earth? Not while Venus and Mercury are still full of minerals. We have several hundred years before they'll consider a big treaty violation like coming here."
"They might want slaves."
"A few teleoperators for robot equipment? Humans are hopeless at even that. We can't be interfaced to their computers properly."
"None of these species would find us tasty. We'd probably poison half of them. Besides, abducting cattle is less trouble and has more meat."
"You're saying we're safe, for now."
"I'm saying the aliens couldn't care less about us. If they stick to mining. Unfortunately this is looking like blowing up into a local resources war with us helpless in the middle."
"What can we do?"
"Nuke them," proposed the president of the RSA (Reunited States of America, otherwise known as USA2, USA TNG or USA - the sequel's never as good!).
"How long would it take to send a missile to Mars?"
"I don't know. Not long."
"Try six months. That's a hell of an early warning. They'd just knock it into the sun and call 'PULL'."
"We should have kept at StarWars."
"They made six movies. That's enough."
"I meant the weapons system." The RSA President hissed through clenched teeth.
"I know what you meant!" Steve hissed back. "Star Wars is just what we want to avoid here."
...This lack of awareness was probably for the best, since the present prime inhabitants of Earth have a rather unhealthy obsession with things being blown into tiny little bits, particularly each other, which is likely a long-term benefit for the galaxy on the whole.
And no, aliens are NOT about to come down and run your planet for you for your own good. If you can't sort out your own problems without a nanny-patrol, why the hell would Galactic civilisation be the slightest bit interested in anything you might think you have to contribute to the universe? Your planet has been fully assayed and the gene pool archived. It can be easily decontaminated, stripped of artifacts of civilisation, and re-stocked less the primate species groups should you make the ultimate balls-up. It wouldn't be the first time it's been done down there!