Who's the preditor?

@ 3 am, I saw a program on Discovery about golden baboons. It showed how different species will help each other when a preditor is lurking about. All species recognize the warning calls of other animals. There was a severe drought and they were all trying to get water. the elephants are known to protect their young @ all cost. they are the largest land mammals. Well the baby died and all the elephants were crying. tears came from a gland near the temple which was a sign of stress. I watched as the mother touched her dead baby & swayed her foot over the body. all the elephants did the same and did not want to leave this baby. It was heartbreaking. The next day, i saw a program on preditors. We all know it's survival of the fittest & animals only kill for food. Then they told about the worst preditor, man. They showed men shooting elephants for fun. I cried & shut off the tv. Why do men kill for fun? Whose the worst preditor, wild animals, or humans? any opinions?