Now try to get into their heads. From their perspective politicians like Jim DeMint and Tom Coburn and Jeff Flake and even Paul Ryan are radical firebrands because they occasionally come up with an innovative idea or stand firm on an issue for reasons of principle. Not very often, but just enough to make the leadership nervous while still largely satisfying their desire for people to stick with the program. From this perspective politicians like Rand Paul or Justin Amash are positively terrifying because they will consistently challenge the system and operate on an alternative agenda which the establishment is constitutionally incapable of understanding.
The establishment of the Republican party has a general idea that the grassroots are not happy with them. They have encountered the Tea Party and it scared them. They have heard about the liberty movement and dismissed it as so far outside of their worldview as to be irrelevant. They cannot deal with the more ideological elements of the grassroots because operating on ideology is so far outside their experience that they have no tools to deal with it. There's no way to fit it into their strategy except as a force to somehow be placated with the right rhetoric and symbolic gestures, but most of them don't have enough contact with the party base to really know what it is asking for. They got huge numbers of phonecalls and emails for Audit the Fed, so they voted for it to throw us a bone, not really understanding that it is merely the tip of the spear of legislative reform which many are demanding, and figuring that somehow that one vote protects and legitimizes them. They stepped outside their box to support that issue and from their perspective that is a huge concession to popular demands.
They have established a norm for the party and varying even slightly from that norm is viewed as dangerously radical. Here's where Paul Ryan comes in. Paul Ryan came up with a budget plan which included actual Medicare reform and budget cuts. From our perspective the plan is kind of pathetic and inadequate, a mostly symbolic gesture in the right direction which produces mediocre results. But from an establishment perspective it's absolutely revolutionary because doing anything except voting for more spending and more pandering is absolutely radical.