I interpreted it as snarking on the current state of affairs. By and large, in the US the point of the prison system is *not* rehabilitation or providing benefit to society. It's about lining the pockets of wealthy people and keeping the downtrodden in that position. And that sucks, but stating it as a matter of fact doesn't mean one supports it.

That's definitely how I interpreted it also, but the comment definitely buries the lede at least