Earlier quoted context omitted.
As this conversation goes, its nature, it lacks any concept of morality. Why is a rock a rock is not a moral question, and it doesn't merit one in my opinion. I think you have to reveal what is the moral question you have about preventing that natural result, and I can try to answer why such a thing doesn't bother me at all.
The OP asked: "Many people think that a supervisor or a manager should make more money than the person reporting to them. I ask why" You responded: "In general the supervisor or manager provides more value than an employee under his command." I asked: "why do you think this is the case" And I got the pretty much textbook economics reply. But I am not asking about what economists think, I wonder about what you think.…
In general I see people getting what people are willing to give them, even when its an 'unfair' situation (i.e. the son of the business man getting preferred treament).
The opposite, people getting what they have by taking it from people unwillingly, which I find aberrant, is seldom what happens in this scenario, and more what happens with proposed solutions around income inequality.