Final answer:
The Kitty Genovese case challenges the concept of ethical subjectivism by highlighting the role of bystander intervention and the bystander effect.
Step-by-step explanation:
The Kitty Genovese case does not directly test ethical subjectivism or address objective moral values. The case, however, does challenge the concept of ethical subjectivism by highlighting the role of bystander intervention, especially the phenomenon known as the bystander effect. The bystander effect refers to the tendency for individuals to be less likely to intervene in an emergency situation when there are others present, as they assume someone else will take action.