They do to the exact same extent as anything else supported by tax dollars.
And you're still missing the point, which is, again, that Romney acknowledged the importance of community support for personal achievement, exactly the same way Obama did.
You're a liar or idiot, as I said. No other options available here.
The video shows with 100% clarity that Obama was saying that business onwers didn't build the infrastructure that helps their businesses run. This is made obvious by the emphasis on the word "that" at the end of the sentence - if he was referring to the businesses, he would not have intoned in that manner. Also evident is the fact that he also said "that" before the phrase "you didn't build that".
This video contrasts the tone and language Obama actually used with Romney's misrepresentation of it:
http://www.youtube.com/watch?v=z-z-U57BaSc&feature=player_embedded -- if Obama meant what Romney claimed, he'd have said it the way Romney said it here. He didn't.
Romney's not stupid, so he has deliberately mischaracterized Obama's comments because, like many of his supporters here, he's a lying asshole -- just like the people who have deliberately mischaracterized Romney's comments on the poor and other subjects.