I mean, you've literally brought up the main point that proves you wrong... then tried to ignore that fact... and in general ignore that there are places with private roads, and other countries where the goverment uses functions that would work just like private methods would.
With the defense seemingly being "Because some roads wouldn't be built without the government, all roads should be built by the government."
Which seems like a poor arguement to say the least. The "Bridge to Nowhere" is a project your familiar with... and were against being built afterall. It's true that without government it would of never even been considered being built... and shouldn't of been. Taxes collected nationally but spent locally on roads are just a bad idea.
2/3rds of swedish roads are private as was mentioned above.
Apparently they do a better job... for cheaper.
http://trid.trb.org/view.aspx?id=783498
Just one datapoint of course(since it's one country)... but something to consider.
Personally, i'm more for all road taxation to come directly from local governments. I feel like it's the best way to handle things to prevent corruption, but also keep roads where people want them.
However, I'm not dismissing private roads like you are... when they are perfectly viable in most cases.
