It's simple. The private sector makes money whereas the government wastes money.
Which is why the government runs the Army, the Navy, the Air Force and the Marines. The DMV, the IRS, the FBI, the post office, NASA, Medicare, the CIA, Medicaid, the VA, government inspections services which inspects places such as nulclear power plants, electrical grid, road, bridges, hospitals, airlines. And that's not even a tenth.
The truth is some areas are run better than others. It depends on the resources available and the talent of the people involved.
Republicans very rarely display talent since being taken over the by the radical religious. Why worry? They have God!