Rafiki, acted as simba's really world representation of his superego. By pushing him to return to the pride lands during a time in which he was indulging in id satisfying behavior as an out cast with timone and puma.
Because while some people are assholes, most are not, and animals tend to have more love than most humans. So glad to see a happy ending for these animals. I'm confussed why a drug dealer had a tiger and a bear