(1)
Once again (and I will revive that thread... someday...), "libertarian" is a meaningless term. You can have Hitler and Stalin supporters arguing
ad nausium over who was more libertarian! I'm an Anarcho-Capitalist (
gradualist, Rothbardian, with a little bit more Parents Rights mixed in). What I have is a specific well-defined philosophy. "Libertarianism" isn't.
(2) You can't argue the effectiveness of something (building pyramids, putting a man on the moon, etc) without considering return on investment - what benefit that project brought, and to whom. Only voluntary action (i.e. free market capitalism) can organize society in such a way as to do things at the right time, in the right place, in the right way, for the right reasons, with the right people in every position, with the right people paying for it, and with the right people reaping the benefits.