As you mentioned, the government doesn't have to completely fund a project. The government could help them along, though, with private investors.
Have you traveled by airplane lately? You have to get the airport 1 1/2 hours before the flight leaves and then you have to collect your luggage at your arrival airport. So traveling about 500 miles would take about the same amount of time by airliner as it would high-speed rail.
Of course it would be faster to fly from coast to coast. But some people do not like to fly, and others enjoy the view from a train. There would be branches on the line to the south and north to major cities,. A high-speed rail system would be particularly useful if you say wanted to visit a neighboring state.
Projects like high-speed rail would provide more jobs and create something useful.
We also need to rebuild many roads and bridges, and the money for that comes from tax dollars.
I live in Texas. We don't need more oil or oil pipelines. We need more wind, solar and other types of power, along with electric vehicles. Oil is killing this planet, and oil companies are laughing all the way to the bank. Oil is also driving many of the wars we have seen in recent years.
Most economists say there is little chance that the U.S. financial system will collapse. And China just wants to sell products to the United States. We went through the Great Depression, and we will always have ups and downs, as we just experienced. But roving bands of armed people have never started killing to get food. Half of the men in the U.S. were out of work at the height of the Great Depression, and the chaos didn't happen. If you want to move to another country, fine, but don't blame it on what remotely could happen in the future.
I have been to other countries. Many of them do not have the infrastructure and services that are provided in the United States by federal, state, county, and city governments. The one thing we need to do to clean up politics is to get money out of elections. The worst decision by the Supreme Court in recent times was Citizens United. Money is not speech and corporations are not people. This must be overturned.
Back to the original topic. Attacking foreign countries is a huge waste of life and money.
Private companies will not invest in projects that are not going to make them money...Hi speed rail is to costly as we are demonstrating in California and if you poll people, very few are going to take it..It is a waste of capital and taxes. There is no money for roads and bridges unless you borrow or cut.
Keep in mind that for every dollar the state, local, or federal government collects in taxes and fee's is a dollar less that people and business can spend in the private sector. Over 70% of the U.S. economy now relies upon consumer spending / consumer services. If the government
All main stream economist will always state there is little chance of collapse etc, etc, etc. They will also state that the economy is growing blah, blah, blah..There is a reason for this that most do not understand..In bad economic times, people tighten there belts and spend less. That was not a big deal when the economy was 50% MFG and 50% consumer spending. Now that over 70% of the economy relies upon consumer spending if people tighten their belts, the economy would crash. All governments lie and all governments manipulate the economic data...This is a fact...If you knew the government was going to experience a worse economic crash than in 2007, would you be spending money?
The great depression had a little different class of people. Many could also grow there own food and barter was an established practice. The modern day equivalent to the great depression soup lines is today's food stamp and welfare / unemployment programs. 100 million people (1/3 of the U.S. population) is getting some form of government subsistence. As of now, 47.6 million people are receiving food stamps according to the wall street journal. Historically, countries default and hyper-inflate there currencies..When the U.S. defaults / hyper-inflates the dollar, who knows how the public will react...I have to assume the government has a back-up plan...
Many other countries may not have the roads and other things you refer to however, no other country in the world has a bigger debt than the U.S. in dollar terms. We also have the largest amount of unfunded liabilities...somewhere around 70 trillion dollars last I read...good luck with that..
If you want to get the real picture of what is occurring around the world when it comes to global / government / markets / economies / debt..look up zerohedge. They are ahead of the curve on most things.