Try that in Phoenix, AZ in the middle of July @ 3pm - I'll even buy you a 2L Camelpak filled with ice water.

Trust me, about an hour in you'll be begging for a car.

Snark aside, the problem in the United States (especially in the southwest) is that our cities aren't set up for walking, nor do we have anywhere near adequate public transportation.

That can't be changed overnight (heck, the Phoenix Metro area has only had light rail system for less than a decade); cities won't become magically walkable or bikeable (and I can't imagine Phoenix ever being this way in the summer, unless every employer installs showers for employee use).

There's also the factor that many people (though the demographics seem to be shifting) see vehicles as more than a tool; they seem them as objects of self-expression - almost like a mechanical costume, in a way. There's also the fact that car affords you the ability to get to your destination on your own schedule, not someone else's. Plus, there's just the sheer joy of driving for driving's sake (sometimes, I like to drive my car just to drive it - no particular destination or reason, just because I like to drive - fancy that).

They are still subsidized (at least in the US). Almost all public transit in the US isn't self-sustaining based on its fares.

The road tax in gasoline is similar. Additionally, most of the wear on roads comes from tractor trailers, which is why they are taxed additionally.

Also, although buses and trains charge per user, they are also heavily subsidized.

I believe my statement was quite clear. Public infrastructure should not be a la carte.

"Buses and trains" are included in "Public Infrastructure". At least by my definition.