This is such an, "I don't understand how the world works" comment. People aren't spread evenly across the country. There are huge swathes of the country with almost no people at all, and other parts with a million people in a few square miles. You don't just put things in the middle of nowhere where there aren't enough people to justify it. You put in where there are already lots of people to use/pay for/run/enjoy/whatever it.

Compared to how much of the economy they actually account for, cities are vastly under-invested in. Cities subsidize suburbs and rural areas (if you account for where people in the suburbs actually work), and could actually do so just as much, while being nicer themselves, if people like you weren't constantly demanding mal-investment that makes the whole pie smaller for everyone.