The industries that are vital to our nation's infrastructure, like energy, mines, utilities, banks, weapons manufacturing..etc. are managed by the US government. Today many local municipalities run the electric companies and several other utilities often offering lower prices than private companies. The earnings of these publicly owned companies are deposited in the public treasury, in order to pay for healthcare and education. etc. Infrastructure development.
You would rather give this money to billionaires, I would rather have my democratic government (government for the people, by the people), deposit this money in the public treasury and use it to build up the country. The American people own certain resources collectively, as a community. It's our common wealth, belonging to all Americans, not a billionaire or privately owned companies.