I’m not sure that’s so true. I think there’s probably still some “reasonable” Republicans holding office, but they don’t have reasonable constituents. They know as soon as they try and break ranks they’ll be called a traitor on Fox News that very night.
They whipped enough fear among the white nationalist crowd and lent them enough credibility where that kitty turned tiger, and these “reasonable” Republicans find themselves unable to do much but hold onto its tail.