Conservatism's circular thinking

Pop quiz.

Question: What fundamental differences inhere in the following assertions?

a. I willingly admit that I base my worldview on Mein Kampf, which I believe is true. Opinion changes, but truth doesn’t.
b. I willingly admit that I base my worldview on The Collected Ravings of Newt Gingrich, which I believe is true. Opinion changes, but truth doesn’t.
c. I willingly admit that I base my worldview on Geoffrey of Monmouth's Historia Regum Britanniae, which I believe is true. Opinion changes, but truth doesn’t.
d. I willingly admit that I base my worldview on the Bible, which I believe is true. Opinion changes, but truth doesn’t.

Answer: Except for the superficial differences in the works' titles--and, OK, "b" is fictitious--the assertions are essentially identical. All are propagandistically oriented in a logically fallacious seduction--I believe something to be true, and Truth doesn't change, therefore my belief is a righteous one. 

Nonetheless there's an enormous difference in practice. Expressed beliefs in the legend of King Arthur, or in the ravings of a repeatedly disgraced American pipsqueak, or in the rambling incoherence of a bloodthirsty megalomaniac are generally left unembraced by others as genuine expressions of a genuine and universal Truth. Yet if some self-styled holy man, say, a Rick Warren, appears on cable television and utters "d" in its precise formulation, his internal piety is conceded by many, if not the Truth itself. 

Why? No particular reason (or Reason), other than that lots of viewers believe it, their parents most likely believed it, whose parents believed it, whose parents believed it, and so on. And there you have it--the principal, traditionalist case for conservatism, both religious and political: an unthinking, logically fallacious fealty to Beliefs in Truths as revealed by Beliefs.

Religious conservatism in Western civilization is, rather rapidly, being escorted away for safe keeping chiefly in the columns of Ross Douthat. As for political conservatism's economic-"theory" traditionalism, the combined imbecilities of Europe's austerity and America's tea partyism are finally revealing the immense logical chasms between belief and truth.