Where did I write that? I included the excerpt from the article to demonstrate your intellectual dishonesty in selectively quoting a single sentence from an article that is positive about the effects of immigration. I did not make any moral judgments anywhere in my comment. Quite the contrary -- I argued that a moral judgment in this situation was not possible to make.

What legal framework have I dismissed which determines what someone deserves to earn, aside from the minimum wage?

We are debating the same thing. I'm arguing that your assertions have no basis. If you don't know what is fair, you cannot know if someone is treated fairly or not.

You have no basis for your claim that some people are paid less than they deserve to be paid, unless you know what they deserve to be paid, and can demonstrate that what they are actually paid is a lower number than what they deserve to be paid. That's not a vague argument. It is very clear. It's also not existentialist, and if you think it is, you don't know what existentialism is.