Subjectivist ethical theories would fit best with the claim or doctrine that values of what is morally right or wrong are like , i. e., simply a matter of personal preference based solely on each individual's personal opinion.

flavors of ice cream

Explanation: Subjectivism theory sees values of what is morally right or wrong like the "flavors of ice cream" i.e values of what is right or wrong is just a matter of what one personally prefers.

This theory holds that there is nothing like objective moral truth and and the only standard of judgement should be that of individuals rather than communal i.e the standard of judgement should be the individual moral conscience.

no because it could make the world a terrible place to live in.