"Earning a living" doesn't state that people should die if the choose to be a grifter or a thief or some other dishonest person that takes from others and doesn't contribute to society. It just means those people didn't earn their living.

In a functional society everyone should contribute to better the society. "Earning a living" is a statement of pride in contributing to society value equal to or greater than the value you get from it. If someone is making a living through dishonest means so isn't earning a living, it can be something they should be ashamed of

Note that socialist societies have similar expressions like "from each according to their ability to each according to their need". The intent is the same, encourage people to contribute to society. What if I don't contribute according to my ability and just want to take what I need? Does that statement imply I'll be sent to a gulag if I don't contribute according to my ability? OMG socialism says I don't deserve to live!!!