Sarah: Some schools seek to foster a habit of volunteering in their students by requiring them to perform community service  But since a person who has been forced to do something has not really volunteered and since the habit of volunteering cannot be said to have been fostered in a person who has not yet volunteered for anything, there is no way this policy can succeed by itself  Paul: I disagree  Some students forced to perform community service have enjoyed it so much that they subsequently actually volunteer to do something similar
In such cases, the policy can clearly be said to have fostered a habit of volunteering
He argues that a policy Sarah fails to consider could accomplish the same aim as the policy that Sarah considers.