Humanity is a weird combination of pure evil and being an idealistic dreamer.

Humanity also thinks strangely emotionally rather than rationally.

And (most of) humanity is naive regarding its belief that science and technology is enlightenment and the answer to everything.

Also I think we're doomed because of our ability to ignore the obvious, namely our unsustainable treatment of the environment (or at least our propensity to think about it and pay lip service to it and then continue to live as if it's not an issue..).