With respect - copyright's protection of income is the point

That's, by design, the tool used to encourage people to invest their time into producing works.

We would not be having this conversation at all if people weren't able to make money of these works - there'd be no point to copyright at all if there wasn't money to be made (by the artists) and the reproduction of their works wasn't restricting their ability to generate that income (for themselves, or their agents).

I want to emphasise that I am not arguing in favour of the system, only how and why it works this way.