This dreadful discussion again. I am all for science'ing morality, but it seems people keep forgetting what science about. Science is first and foremost about describing and predicting the natural world. It's not about telling you what to do. It's about telling you what will happen when you do a thing.

If you want to do science of morality, you have to observe how actual people behave and react in the real world. Forget whatever morality system and thought experiments you heard about in philosophy class, nobody behaves that way. Forget the bible as well, as nobody behave according to that either, even if they claim so. Look at how people actually act. Look at how indoctrination can influence them. Look at how in-group/out-group drastically changes things up. All that stuff.