Can someone please explain to me why people who have 0 understanding of economics should be able to decide who runs their country?

e.g a few days ago I was talking with some of my friends about how "the government interferes too much in the Australian economy. We should have a freer market". and their response was "But if the government doesn't interfere then how will we get healthcare or afford things? Only rich people will be able to afford things if the government doesn't interfere."

When he said this, it made me understand that he didn't understand the free market, so why should he vote? Why should people that are educated in both Austrian and Keynesian Economics (and other economic models) be the only ones to vote on economic matters?