Consider the following thought experiment:
Some kinds of spiders species while mating the female eats the male. Sometimes when female puts and egg and later when it hatches the baby spiders eat the mother. ref here What if there were some alien species out there that shares the same nature as spiders which are technologically thousands of years head of us? What if we considered this species' ways "inhuman" or "unnatural"? What if they were way more intelligent than us and knew more about us than we know about ourselves?
Is humanity ready to accept the existence of an extraterrestrial species? Would the average citizen of the XXI century would like to know or perhaps It would be better to society to remain ignorant? Knowing the way humans have been treating each other in the past, what would be our natural response to this event? Would that be great as Ronald Reagan told Gorbachov (ref video here) because we could forget our little differences? Is humanity really ready for this? Are there any serious authors who ponder abut this?