One characteristic that all successful systems that we know of share is a division between "us" and "them". And our greatest revulsion is reserved for "almost us", who presumably are competing with "us". Any group that gets painted as "almost us" can receive intense bigotry - be they Jewish, black, LBTG, muslim...
One of the characteristics of current Western moral fashions is that "us" should be painted as broadly as possible. It is not in fashion just to talk of rights for ourselves, we talk about universal rights. We do not just grant those rights to people we like, we grant them to people of different religions, different races, different sexual orientations, etc.
To me this aspect of morality - that there are universal principles granted even to those we don't like - matters a lot. Yet if we go off of evidence from nature, it is exactly this that there is the least evidence that is innate.
One of the characteristics of current Western moral fashions is that "us" should be painted as broadly as possible. It is not in fashion just to talk of rights for ourselves, we talk about universal rights. We do not just grant those rights to people we like, we grant them to people of different religions, different races, different sexual orientations, etc.
To me this aspect of morality - that there are universal principles granted even to those we don't like - matters a lot. Yet if we go off of evidence from nature, it is exactly this that there is the least evidence that is innate.