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Originally posted by pk1yen
If any theoretical aliens were hostile, we'd be screwed. There'd be no last minute savior in the form of a renegade hero, and no coincidental success because the aliens overlooked some important fact like bacteria.
All that would be necessary, would be to either purge the planet with radiation, and kill everything, or, create a virus to destroy humans, leaving the animal life available for study.
If they have the technology for the journey here, they have the technology to kill every last one of us.