Sure, they're sorry now -- possibly quite sincerely -- that they used racist dog whistles to shore up their party with whacko-crazy fringe members. They don't consider Trump and his supporters to be "real" Republicans, and I would agree with them about that, too. But I see few signs that they are sorry for the traditional core beliefs of the Republican Party itself. Trump wasn't holding a gun to their head when Reagan broke unions or touted the benefits of trickle-down economics, or when Bush Jr. decided that obliterating Iran was a lucrative response to 9/11. Mitch McConnell is not a Trumpist, but he's been abusing his power of office long before Trump was elected president, and I don't hear the loud clarion call of denunciation from them even now.
I don't trust them to have changed their stripes, just because they refuse to jump hoops in a circus freakshow. They're still predators.
I can’t agree they are all predators.
People evolve and so do parties. Here are the votes by parties for the Civil Rights Act of 1964:
Democratic Party: 152–96 (61–39%)
Republican Party: 138–34 (80–20%)
Cloture in the Senate:[25]
Democratic Party: 44–23 (66–34%)
Republican Party: 27–6 (82–18%)
The Senate version:[24]
Democratic Party: 46–21 (69–31%)
Republican Party: 27–6 (82–18%)
The Senate version, voted on by the House:[24]
Democratic Party: 153–91 (63–37%)
Republican Party: 136–35 (80–20%)