If I may play Devil's advocate here - it is very easy to anthropomorphize animal behaviour. There are numerous examples in the animal kingdom of animals protecting and even rearing animals from other species. This could be down to genetics and learned behaviour and nothing to do with altruism, or other noble sentiments.
Part of me says it is highly unlikely that Humpback whales have a vendetta against killer whales and are the policeman of the oceans, but the bigger part of me, wants to believe that they are exactly that!
Part of me says it is highly unlikely that Humpback whales have a vendetta against killer whales and are the policeman of the oceans, but the bigger part of me, wants to believe that they are exactly that!