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Since membership to a particular criterion does not seem to offer the criterion for
applying the principle of equality, Singer proposes the criterion of Sentience. This is the capacity
to feel pain and pleasure. In his argument, he presents an example showing that trying to apply
other criteria as a basis of moral importance; human beings will end up finding ways to exclude
others whom they feel should not be treated with similar equality. For instance, he states that
human beings could view animals as not important because they do not have similar intelligence
levels as that of human beings. However, it can be noted that in some cases, human beings can
be less intelligent when compared to animals. People who are suffering from dementia are
sometimes said to be less capable when compared to animals. However, this does not make them
unimportant as human beings. This means that using intelligence as a criterion for moral
importance is not plausible.
In the second argument that is presented by Singer to support the criterion of sentience is
the virtue of being sentient. He states that its only through the virtue of sentience that anything
can be said to have interests. All animals and human beings have the virtue of sentience, and it is
because of this inclusivity that has made the criterion of sentience to be different from the other
standards that have been developed for moral importance and the principle of equality. Singer
argues that before we speak of interests in any meaningful way, there is need to ensure that the
capacity to feel pleasure, this means enjoying and suffering has to be satisfied. In this argument,
Singer tries to show that offering moral considerations to anything that does not have sentience,
the ability to feel any suffering or pleasure is of no use. However, there is also a contrary
argument that is developed against this criterion. For instance, people who are in an irreversible
coma could have lost their sentience features, and this criterion could have locked them out of
being treated in an equal manner as the other animals and human beings. Even though he states