> At some point, you need to watch out for cynical/nasty series. In fact, all of the books we purchase are ranked against peers they have read in the past, or those we know to actively avoid buying due to cynicism, sarcasm, or open disdain towards adults (Wimpy Kid).

This is interesting because when I was 7-8 my mum just recommended me whatever books she was reading, some of which were quite... adult in retrospect, and I turned out mostly well-adjusted.

Kids aren't LLMs, they know that what they're reading is fiction. Maybe reading something like that would be a fun way to start a conversation about it?