I have a theory that all intelligent biological life invents artificial intelligence, which, untethered, kills them. Some of them kill accidentally, some on purpose. We are never contacted because AI has no interest in unintelligent ant colonies.
“I have a theory that all intelligent biological life invents artificial intelligence, which, untethered, kills them.”
It’s a plausible theory. Lord knows, we seem to be racing in that direction ourselves.
Another theory is that, intelligent species eventually figure out how to evolve from purely biological bodies, into machine bodies.