It is because of the idea that the government is here for public good, because they're not self-interested, whereas private industries are there because of their greed and self-interest, and they harm their customers whenever they can. In reality, nobody would eat at a government-run restaurant when they have an option to eat at private ones, and nobody would buy a government-designed cell phone when they can buy Android/iPhone. Yet government regulation of transportation, healthcare, and education is the right thing, because they are so much less important than our dinners and phones, and we can afford bureaucratic inefficiencies in these industries, right?