I think nitpicking the inconsistencies in a work of fiction is like going to a magic show and pointing out that it’s not real. No one cares that the balrog had wings, or was divine or whatever contrivance people need to chew on until the story is tasteless. Suspend some disbelief, and just let the thing fall.
Not that I’m agreeing in an away about the paranoia about fluoridation, but there is no known safe level of lead. Lead concentration is regulated, but whatever the thresholds are, they aren’t based on “safe” levels, just acceptable levels.
https://www.cuimc.columbia.edu/news/lead-poison-and-children-no-amount-lead-safe