@OGjester Sadly I agree. it's made me realize how dangerous tribalism is, because I don't know what else it could be! My sensible, educated and kind sister and BIL are Trumpers! But the thing is my BIL especially is a hard core republican. He wouldn't vote outside the party for any reason - hence his support for Trump. He might prefer a more sane republican but if Trump is the nominee he will vote for him.
So, I think that is part of it. Along with closet bigots that can now proudly be bigots.