Has anyone considered the historical evidence of what happens when superior civilizations encounter lesser ones?
The Native Americans, the Mayans, the Incas, the Australian Aborigines, the tribes of South America, the natives of Pacific Islands, to name a few, all cry out to humanity to avoid at all costs encounters of the first, second, and third kinds.
We have no reason to expect anything but annihilation from advanced alien races-
either they are truculent and violent like we are, or they will destroy us as a service to the rest of the galaxy.
We do not wants aliens to find us!