It's a useful theory since human beings are often more interested in assessing the character of another person than they are in assessing the goodness or badness of a particular action.
This suggests that the way to build a good society is to help its members to be good people, rather than to use laws and punishments to prevent or deter bad actions.
But it wouldn't be helpful if a person had to be a saint to count as virtuous. For virtue theory to be really useful it needs to suggest only a minimum set of characteristics that a person needs to possess in order to be regarded as virtuous.
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