That's actually the root of all social philosophies: they require decent people.
No matter which system you take, capitalism, communism, anarchism, monarchy, democracy, etc. they all would work perfectly fine, if people wouldn't be stupid, selfish and about 1% downright psychopaths. And I'm not even talking about real crimes. In your example it would be perfectly legal, to pay the workers the absolute minimum possible, but it would be a dick move.
At the end of the day, a system always has to answer the question: How do you reign in assholes? That's it. Designing a system based on Jesuses is trivial.