That is a good point, its just I've run into that passage copypasted over and over and see people support it over and over so I got a little hasty :). Obviously the government provides things, and it even provides some of them extremely well. Some of the things that it provides likely would not be provided for by the free market in the present (such as manned moon missions). But that is only considering the "seen", not the "unseen". Every dollar the government spends is in the end taxed from citizens (either directly or via inflation).
So we "see" the moon landing, the roads, health care, etc, but there is no way to even consider the "unseen" that we have lost. Furthermore, even assuming a government running at maximum efficiency, we still must consider the deadweight loss from taxation.