Doctor Who

For most of this episode I thought it was a good (if a bit on-the-nose) commentary about our societal distraction sickness and everyone living literally in a bubble. The hero was someone who literally able to walk on his own two legs, etc. But once they went underground everything kind of went loopy?

Where did the slug monsters come from? The idea that they came from "outside the (city's) bubble" kind of reinforced the idea that it's dangerous to hide from what's scary. But then we see the homeworld was also eaten destroyed by the same slug-monsters? If the slugs are controlled or created by the dots, are we meant to understand that the people of the home world are similarly walking around in bubbles? If so, then why does Finetime exist? The whole premise of an off-world "perfect" colony seemed to imply they were providing some service to the home-worlders beyond their 2 hours of "work". Why would a society of people living in bubbles send their youth to a faraway planet?

Then we see that the dots are capable of quickly killing the inhabitants. So where did the slug monsters come from? Why did the dots not just kill zippoty zop? Were the slugs obeying the dots alphabetical order parameters? Were they created by the dots?

At this point I was like "whatever it's Doctor Who, the plots are never as consistent as the vibes!" But then the vibes changed completely when it's revealed everyone is racist?!

My best guess is that this is some bungled way of comparing the people of Finetime to our modern social problem with radicalization on social media, like "look beyond yourself man" but that feels a bit of a stretch. I feel like I'm missing something big here!