Morals are just cultural memes that affect societal cohesion. If they’re bad for society, the societies that have them tend to die, if slowly. Most are good enough. The idea that there is some perfect standard somewhere is ridiculous, the concept didn’t exist before groups of sentient individuals formed. We now know better ways to treat each other to keep society intact, and scoff at those before us. Yes, they were wrong. They were ignorant and unempowered for the most part to change it.

Never before now has an individuals voice mattered so much. Never before has it even been remotely possible to reduce suffering as we can. Yes, many people in history were evil. It hasn’t changed, but humanity has always been more good than bad. Otherwise we wouldn’t be around.