Henry, I view all morality as subjective, even if it comes from a god (in which case it's the god's subjective values underlying a code of morality).
There is a natural tendency for certain values to become prominent in successful societies. It's difficult to feel safe in a culture where killing is permissible, so one would expect to see a lot of people defecting to safer tribes where the moral code prohibits killing and members of the tribe protect their neighbours from harm.
IMO, moral codes are beginning to move beyond basic needs like physical safety and are becoming more supportive of individual differences (on the condition that those differences do not cause direct harm to someone else, which would be a violation of the need for physical safety). In that regard, one could possibly create a hierarchy of morals analogous to Maslow's Hierarchy of Needs.
There is a natural tendency for certain values to become prominent in successful societies. It's difficult to feel safe in a culture where killing is permissible, so one would expect to see a lot of people defecting to safer tribes where the moral code prohibits killing and members of the tribe protect their neighbours from harm.
IMO, moral codes are beginning to move beyond basic needs like physical safety and are becoming more supportive of individual differences (on the condition that those differences do not cause direct harm to someone else, which would be a violation of the need for physical safety). In that regard, one could possibly create a hierarchy of morals analogous to Maslow's Hierarchy of Needs.