http://www.nytimes.com/2005/04/02/technology/02darpa.html?_r...
Arrington actually argues in favor of heavy government intervention: high speed trains, subsidized computers for children, etc. Just not the kind which might conceivably worry Silicon Valley investors.
I agree with some of the article's stances -- like on net neutrality and probably copyright.
Governments like to spend money, he's suggesting what he sees as the least harmful ways to do that, not suggesting, at least in this post, that they do it in the first place.
(While he's not making it here, there's a strong argument to not do "unnecessary" government spending since it crowds out what the market would choose. Every dollar borrowed to build high speed trains is a dollar plus overhead not available to fund a startup.)
With the single exception of the post-WWII government supported basic and applied research model. This would sometimes produce the basis for new toys the military then bought, but it's most certainly not the sense in which "public-private partnerships" is used today.
Again, the government was buying "stuff", abstract stuff, I grant you, but we're not talking about e.g. "investing" half a billion dollars in a solar cell factory who's production will only find a market due to hefty government tax breaks.