It's what makes the episode, IMO, and it's something that a lot of people don't seem to notice. We never see police or enforcers. The closest thing are the stage hands at the show, and they're not that close. We don't see someone carted off to become one of the janitors, for example, which a lesser show or concept would have depicted explicitly. Then at the end we see that the outside world looks fine[1], if neglected (by humans) and wild. People are where they are due to lack of will and imagination to make something different for themselves.

[1] There's some debate over whether those are real windows or viewscreens, but since one of those options acts a punch-line to this theme and the other serves basically no purpose, I'm pretty sure we're supposed to take them to be real.