My own hypothesis, hoping for your ideas and comments.

- Humans took psychoactive mushrooms in the stone-age

- Those shrooms jumpstarted our brains over years and years and gave us an edge over other species

- But it might have been too early for us, our brains are still hardwired like "us against the rest of the world", we lack several evolutionary steps

- That's why we keep killing everything, and that's why we still love all kinds of hocuspocus (religion, esoterics etc)