So many libertarians are atheists, so it is hard to take them seriously. An atheist, after all can justify anything. Lying is fine for an atheist, so why trust the word of a libertarian who says he is not an atheist?
Indeed. That's probably at least part of the reason that I tend to scorn Libertarians. But the rest of it consists in the hatchet-job that Ayn Rand — that infantile ignoramus — perpetrated on Plato's works and reputation. So many Libertarians light candles, and give their obeisance, to that very strange woman.
Bottom line, atheists have no ground or measure for objective Truth. Once you get rid of God, you have nothing to stand on in that way. So they just make it up as they go along, citing "reason" as a defense.
But Reason, absent a Ground in Truth, becomes unreasonable.
JMHO FWIW