It's clear that humans will believe anything that allows them to fit in to their tribe, and spend a lot of effort both signaling tribal affiliation and defending those beliefs from any incursion of facts or reality.

And this is fine, whatever, to each his or her own--until it results in hate and violence.

I don't think we'll overcome tribal divisions anytime soon, but we *can* take steps to draw strict boundaries around aggressive behavior when one group or another decides to impose their beliefs on others.

You can't reason someone out of a belief they didn't reason themselves into--you can only peacefully live and let live, and defend yourself vigorously if they do not.