Mr and Mrs. Hadley wanted the best technology for their kids, so they can live easier, and then the kids used the technology against them.
Technology and spoiling
Over spoiling your kids leads to conflict.
“You’ve let this room and this house replace you and your wife in your children’s affections. This room is their mother and father, far more important in their lives than their real parents.”
Mr. and Mrs. Hadley, Peter and Wendy
“They walked down the hall of their soundproofed Happylife Home, which had cost them thirty thousand dollars installed, this house which clothed and fed and rocked them to sleep and played and sang and was good to them.”
"“Too much love never spoils children. Children become spoiled when we substitute “presents” for “presence.”” - Anthony Witham. "
Too reliant on technology
“George, you’ll have to change your life. Like too many others, you’ve built it around creature comforts. Why, you’d starve tomorrow if something went wrong in your kitchen.”
The setting contributed to the theme because it co-created the conflict with the children and parents.
I think the setting contributes to the theme the most because the nursery and Happylife home created their technology addictions.
Peter and Wendy used the nursery to kill Mr and Mrs Hadley, which shows they became too attached to their technology.
The family became reliant on technology, especially the kids. It leads to them being too attached to the nursery and unattached to their parents.