Be that as it may, the Libertarians and Moderates are still ultimately very small parts of the party. How often do you see their viewpoints put up by the GOP, or even not crushed under party loyalty?
That's because of the way that the self identified establishment displays themselves. When the true believers get BENGAZI some silly BENGAZI thing BENGAZI in their heads the establishment crowd panders to them. That doesn't mean they are true believers themselves, they change their views at a moments notice if need be. It serves them quite well to sound BENGAZI but they don't care about that stuff, they just want to win. And this crowd has a strong track record of dominating party politics, although recent events (like Ted Cruz not getting excecuted for stupidity.) do indicate it's weaker then before.
It has more to do with the money. A fairly small number of ultra-rich individuals and a somewhat larger number of corporate sponsors have pumped ungodly amounts of money into the Tea Party and Religious Right, because the former is essentially a MAKE ME RICHER AND TRICK THE LITTLE GUY INTO THINKING I'M LOOKING OUT FOR HIM group, while the latter plays quite well with America's large Christian majority (while the Left is not actually anti-Christian, the social environment that left-leaning groups such as the ACLU sought to equalize was historically slanted massively toward Christians, thus they gained an unfair public image), particularly the older generations.
It is important to keep in mind that the Republican Party has essentially been dying since before WWII, managing to gain power only when they find a way to attack the incumbent Democrat or have a candidate like Eisenhower that essentially can't lose. That's why the party's so hard-line. Anything less than all-out attack means that they are surrendering ground that they can not afford to lose.