Three hypothesis which may not be mutually exclusive:
1) Some people disagree (with you) about whether or not some animals are persons.
2) Some people disagree (with you) about whether or not being a person is a necessary condition for moral consideration—here you’ve stipulated ‘people’ as ‘things subject to moral concern’, but that word may too connotative laden for this to be effective.
3) Some people disagree (with you) about ‘person’/‘being worthy of moral consideration’ being a binary category.
Three hypothesis which may not be mutually exclusive:
1) Some people disagree (with you) about whether or not some animals are persons.
2) Some people disagree (with you) about whether or not being a person is a necessary condition for moral consideration—here you’ve stipulated ‘people’ as ‘things subject to moral concern’, but that word may too connotative laden for this to be effective.
3) Some people disagree (with you) about ‘person’/‘being worthy of moral consideration’ being a binary category.