Reply #6: The combination of true belief and messianic zeal is

[Warpy]

generally impossible to penetrate, but very plucky of you for trying.

I generally just tell them that libertarianism/the Austrian School suffers from the same problem Marxism does: they both require the perfection of the human species in order to work.

Then I become unavailable while they rattle themselves to pieces over being compared with something they find so abhorrent.