Is morality objective or subjective?

[Mister Agenda]

Evolution is the source of our pro-social moral sentiments. It's why we care about fairness and protecting children and not causing needless suffering. It's also the source of our less-than-stellar sentiments like jealousy and greed that nevertheless helped our ancestors propagate. Those pro-social sentiments are the root of our motivation for caring how we treat each other, and the selfish sentiments are why we need rules and laws instead of it all working out by instinct. Our instincts are at odds with each other.

So we have the instinctual moral commonality that the vast majority of us would agree that pointless suffering that can be prevented should be prevented and that a society where people are more likely to be happy, healthy, and fulfilled is better than a society that does more poorly in those areas. Those ideas are both useful and self-evident enough that it would be hard to find someone who would sincerely argue the opposite. Granting that they're self-evident because we're genetically programmed to like things that are good for us, they make good first principles/premises/axioms for further moral reasoning.

It doesn't get us from an 'is' to an 'ought', but I think the idea of some sort of ultimate grounding for morality being a requirement is refuted by the existence of moral systems in every society. Morality is a practical matter, not a cosmic one.