OK, smart guy, you explain it to me. What possible reason would the GOP movers & shakers have for advancing conservatism, if they know that they can depend on getting conservatives' votes no matter what they do?
They don't know that they will get conservative votes no matter what.
What they do know is that when you run the numbers, the disgruntled faction is smaller than the disgruntled faction would be if they did exactly what the disgruntled conservatives wanted.
It's really not rocket science.