You aren't a dog and you aren't a monkey.

Human nature is to cooperate and share among the tribe, and the tribe is basically just "anyone who lives in the same place." Yes, maybe expanding the tribe to include "everyone everywhere" is beyond human nature, but we're extremely good at welcoming new people into the tribe. There are countless examples throughout all of human history of new people being welcomed in despite being different, and that's so very different from basically the rest of the animal kingdom. Humans are amazing, stop being a misanthrope.