"Naive" is right. Don't these guys remember 1995 and Newt Gingrich and the new Republican majority "stealing Christmas"? Right before they negotiated with Bill Clinton major entitlement and tax cuts that put the U.S. on the soundest fiscal footing it had seen in decades.
It's always the last generation's Republicans that were the reasonable guys and this year's that are bought and paid for radical nutjobs. I'm not old enough to remember the political 1980's that well, but my impression is that Reagan, the guy who "couldn't be nominated by today's Republican party", also caught a lot of flak as a radical who was going to start WWIII.
With a four year interruption during two unpopular wars and an economic meltdown, a strongly anti-tax majority has been elected to the U.S. House for almost two decades, well before anyone had heard of the "Tea Party" or the Koch brothers. One could argue that they've been fairly consistently anti-entitlement growth as well, given the contortions Boehner and Hastert had to go through to get Medicare Part D passed.
It's not a conspiracy, it's what American voters apparently want in the house of Congress that most directly controls the purse.