Comment by bluGill

There is the idea sometimes stated that because child mortality was so high in the past parents had kids but avoided loving them - because odds were against the child living past 5 and if you love your kids you then have heartbreak when they die.

Historians disagree with that idea (at least for most cultures?). However I've heard it more than once. This just gives more data to the idea that humans loved each other enough to take care of injured.