Salon did an interesting article on libertarian atheists versus liberal atheists.

The Atheist Libertarian Lie: Ayn Rand, Income Inequality, and the Free Market (Salon, 2014)

They assert that the libertarian position on free markets as existing in some sort of privileged position that cannot be questioned is sort of the rigid dogma that atheists try to avoid (thus strawmanning atheists somewhat, since atheism means absolutely nothing other than the disbelief in the assertion of a god or gods).