Bradbury is making a specific critique of society through the character of Mildred and her digital family on the wall. What is he arguing?

If you think about Mildred's attachment to the "walls" and her "family", you will see a drirct correlation to the way in which people perceive reality televsion today. Viewers become so engrossed in the lives of people they've never met, that those people are perceived more like "family" than the people they live with.