... what's good for society as a whole.
I don't think that I need to even support that statement with examples! I assume that people have observed it everywhere!
There's indeed many white people who are outright racists, believing they're "superior" and such, but then there's some who see black people rioting in the news and feel fear. If they saw videos from Milwaukee recently, they might have even seen some AA people saying, "Get him! He's white!" Or they might have seen some white people pulled from their vehicles and assaulted in Los Angeles after the Rodney King police decision.
Being self-centered, they don't step back and put themselves in the shoes of others or try to understand their anger and frustration. They just focus on what affects them, or what MIGHT affect them.
Trump has clearly made some statements that makes many whites think he's got THEIR best interest at heart.
That's what I think explains it, at least partly.
EDIT: I'll indeed give an example... an unusual one. I have a rare genetic condition that causes early blindness. I visited an eye doctor to get another drug injection in my eyeball to slow it down. As I was being prepped, the aide said that she felt "the most sympathy" for their old patients with age-related macular degeneration. I replied that all vision loss is bad, but at least many of them are already retired and they don't need their eyesight as much to work and support themselves. Then I mentioned premature babies who are born with detached retinas, and how that's so sad if it's not fixed. She replied, "I guess. I still feel the worst for the old people. I try to imagine what it's like to get old and have that sort of thing happen to me too."
TRANSLATION: "I'm not a premature baby or have a rare genetic problem, but I MIGHT lose MY eyesight when I get older."