We're supposed to the the highest form of life on earth, so should act that way. We've proven that free will lets some do whatever they please, much to the detriment of others. Killer whales and all other predators usually kill to eat, but some make a game of killing, like the cat family. It is the predatory instinct and when a human is killed, it's still looked at as food, even though a few have killed which appeared to be for sport, like the Tsavo maneaters, although they saw humans as easy prey once they got started.
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