You're being shortsighted, though. This is bigger than Trump. This is about the GOP finding their footing again. They stumbled onto a mascot in Trump that handed them a playbook on how to reach out to and energize not just their base, but future generations of their base. And it's simply a case of seeing that the bill is about to come due for hundreds of years of white privilege, and refusing to put anything on it. Literally anyone who runs with messaging even mildly stating that America isn't racist, or is just fine the way it is and doesn't need to change or improve will see this kind of support.
I think on here we often forget that racism and privelege don't just come in the ugliest forms. A lot of it is just people who can't process other perspectives, and don't like feeling bad.