Government
No one claims government has to be good. It's just that it gets a lot of outside help being bad. When the government runs the businesses, that's Communism. When the businesses run the government, that's fascism.
And yet, these two choices, or some uneasy barely-controlled mixture of them, are the only choices we are usually ever given.
What is it called when the government is kept as firmly separated from the economic lives of its citizens as it is from their religious lives, and for much the same reason?