That one sentence is not the message, the message is
An extreme totalitarian surveillance state will
eventually converge to punishing acts like extra
marital sex or keeping a diary with personalized
torture until victims are broken beyond any thought
of hostility towards their authority figures.
Which is a damn good thing for children to think about. People really are that bad, so hold your freedoms close.
I'll read Lord of The Rings to my kids and let thoughts of Frodo give them the courage and the hope, and I suppose you can terrorize your kids by reading them about "rat face cages" and betrayals and fear culminating in a sit down in Chestnut Tree cafe drinking Victory Gin.