Why? Because they lose their most effective lie that everything sensible is "racist."
Black people are a tool the liberals have been using to hold onto power, and it is always about the power, because through the power they enrich themselves and their cronies.
It has been a trick for over 150 years, and now it's beginning to fail because brilliant black conservatives are calling them out now.
Black conservatives support Republicans today, just as they did 150 years ago.