Conservatives have been fighting for the soul of the GOP for a long time, while the moderates have been pimping it out on every corner down K street and beyond.
The bottom line is that these people got support from the TEA party people based on a set of promises that remain unfulfilled, most prominent the repeal (not tinkering with or rebranding of) the ACA. Other examples apply. Too many awsh*ts and not enough 'attaboys'. As for "Republicans" for whom I recall the term RINO being used, (like McCain Collins, Graham, and Murkowski, for starters), who all too consistently vote with the Democrats, replacement is the only option (although in McCain's case, he might leave office naturally).