You might want to review history and when/where human life has been valued. We are so civilized that we kill 3,000 pre-born babies a day.
“this is based on medieval Europe before the Enlightenment and before any notions of the value of each individual human life.”
Actually, the value of each individual human life is a very medieval idea:
http://monestirpedralbes.bcn.cat/en/content/individualism_middle_ages
https://www.amazon.com/Idea-Natural-Rights-University-Religion/dp/0802848540