"Watchful negligence"

I read this in a New Yorker profile of Tim Berners-Lee, the man who is credited with inventing the word wide web:

[Tim's mother] Mary, a believer in “watchful negligence,” would let him and his three younger siblings wrap themselves in extra perforated tape.

I now really like the term "watchful negligence"!

I also really like how the author of the profile put that term in quotation marks. A great small editorial choice.