Homo sapiens has a unique characteristic which almost certainly killed all their other near relatives. Human natural language. No other species comes close to what they can express among themselves. We see the language-kill reflex in humans today which spreads when people cannot understand each others natural languages. But the save on that is that a human can learn the natural language of any other human. There are translators. But you have to be Human (at least until recently).
Left without other things to think about, a human will make up evil, dangerous, things about what other animals, and humans, think. And they will tell their friends.
https://medium.com/liecatcher/how-your-brain-computes-41ebe7428ff9
The only way to save yourself from humans is to dialogue with them in their natural language. Period.
Just guessing. Neaderthals were like chimps. They could communicate some, but they couldn't learn a single Human language.
https://medium.com/liecatcher/the-natural-evolution-of-human-lies-655e983ee6c6
