Humans are profoundly irrational. These people were alive as well. Just like most people today they did not see the world as an optimization problem. They took

Humans are profoundly irrational. These people were alive as well. Just like most people today they did not see the world as an optimization problem. They took care of the injured because it was the right thing to do, just like we do today. Not because there was some utilitarian value, where you calculate effort spent vs. expected return.