It is likely that Peter Pan and Mrs. Darling have different points of view because they come from different backgrounds and have different perspectives on the situation. Peter Pan, being young and carefree, may have a more optimistic view of the situation and believe that he can take care of himself without feeling lonely. Mrs. Darling, on the other hand, being older and more responsible, may worry more about Peter's well-being and believe that he will be lonely without guidance and support. Additionally, their differing views on Wendy's family may also contribute to their conflicting perspectives.