I think “highly developed morals” refers to, for example, internally consistent morals. Calling them highly developed shouldn’t be understood to imply the morals are “better” or more “right”, only that they are consistent. My neurotypical family members have morals and they will preach those morals to literal death. When actual circumstances of life require a sacrifice of them to live within the morals they preach though, they have no difficulty imagining a special exception to those morals.