The ones that I've read have untouchable sacred cows that shape how they view the world, such as "the market is efficient and self-correcting" or "all/any government/group/societal intervention is bad". These are their holy third rails which cannot be questioned. All other beliefs warp themselves around these sacred faiths until they can satisfiably fit.

It's like how medieval scientists had to use "all scripture is literally true" as their starting point. The actual work is to make reality fit within their required doctrines.