Possibly. I don't think aliens, even the pet aliens/slaves, would do that though. Surely they would know the ramifications?
And a drunk irishman will fuck anything. It's really not hard to see where it all went wrong.
It would make just as much sense for the aliens to dump them in Africa after losing control of their pets and expecting the wildlife to eradicate them and no one else finding and interacting with them.
However they came to be today, it is clear they are a genetic dead end.
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