But look, he demands that we accept it as a tolerable state of affairs!

Taboo "tolerable".

Eliezer says the opposite - yes, no particular person is to blame, but things are still horrible; we're still living in a nightmare. To borrow from left-wing jargon again, I want a right to negativity here, a forceful statement that the default/normal/natural condition is awful, even with no-one to blame, and that there is an ethical imperative to ameliorate it.

What ethical system are you using to make that assertion?

Eliezer is a utilitarian. Yes, it would improve overall utility to ameliorate this particular problem, there are also hundreds of other problems whose solution would also improve utility, and frankly by any measure of urgency or returns to effort, this one really isn't even in the top 100.