I don't think it is in princible impossible to find objective moral values hardwired in our brains that makes us uncomfortable when we do things that is not good for ourselves, or our families, or society.
Last few centuries helped us to trash so many believes that were basically wrong (and amazingly it was even trashing itself every decade now thanks to scientific methods), I don't see any reason that is also not possible for morality, which My gut feeling says is probably a mental optical illusion like thinking the world is flat.