To me, it’s a matter of degree. If you have a core belief that business and our economy doing well as what’s best for the country and the source of the continued health of our democracy and nation, then you can reconcile yourself with GOP policies that may have hurt the little guy to some extent if it led to a robust economy. If you view a good economy as the key to all good things in our country, you can surely overlook individual instances where people on the low economic end of the spectrum (here, read minorities ) take a hit from some of the policies.
That is completely different to seeing millions of undocumented immigrants who are good neighbors contributing to the economy and helping that precious economy being treated like criminals, regardless of their being in the country for decades, not causing any harm, but helping out established businesses in many industries that require undocumented labor because citizen white people don’t want to do it - then the combination of the assault on the economy and the destruction of many industries, combined with horrific human suffering on a bunch of people in a scale exceeding what you were willing to put up with previously would lead a rock rib,old school republican to turn on the current guys.
I always consider myself the last Rockefeller Republican on earth, and thought that conservative business models combined with progressive social issues was the way to go. As long as that business model was not bullshit trickle down. Which is all to say - I could see how those guys came from where they were to where they are.