For centuries, the contents of the Bible were largely unknown and carried forward strictly as tradition (not content). During this time, life was brutal and compassion nonexistent. It was at the moment of the Bible being printed, disseminated and digested by western civilization that society turned. Fuedalism vanished, child labor eliminated, slavery abolished, healthcare became a focus, charity a passion, women's rights arrived...the changes were ubiquitous. Changes began one to two hundred years after in society's hands, once germinated, focused on top priorities and rolled out (which would be almost too much of a coincidence to be possible). But also if one does any looking they'll see that each of these 'empathetic' changes had Christian seeds at their roots. So there is a chance that societal 'good behavior' in theory might just spring up simultaneously by watching others...but based on our medieval behaviors prior to Bible dissemination...it didn't.