No, people (including wildlife photographers) are not on Earth to control nature. Nature, left alone, takes care of itself better than humans ever could. In fact, NOT allowing predators to eat prey would lead to the extinction of the predator species. And predators eating prey does NOT usually cause prey species to become extinct (although local extinction is possible under certain circumstances).

Answering the post above, I did, then I learnt about ecosystems and food chains. The reason they do not get involved because they are not there to get involved, they are there to show how animals act in the wild as if humans aren’t present. It’s not animal rescue and it’s not natural behaviour if a human gets involved.
Every animal needs to eat, and if an animal is a carnivore it is going to hunt smaller animals for food, primarily because a smaller defenseless animal is less likely to injure the predator (although not always the case, watched a documentary on wolves and they take down some big, strong animals).
Plus in a lot of habitats the predators keep the population levels of their prey stable. An over-population of one species could lead to disastrous consequences i.e. food shortage resulting in a mass deaths from starvation.
Taking a wild animals food source just because you are there and can save the prey is one of the most ridiculous things I have ever heard. If you were the cameraman filming on a fishing boat would you cut the net and save all the fish from death?
Most animals kill primarily for food or to protect their food source, humans kill other species for food, clothing, furniture etc and sometimes inhumanely i.e. battery hens, at least Mr Antelope out in the wild has the chance to run like hell before a lion catches it. Survival of the fittest.

Get with it PBS Nat Geo – BE ALL THAT YOU CAN BE… BE THE CHANGE YOU WISH TO SEE IN THE WORLD.

INTELLIGENCE FOR GOOD OR BAD… JUST TAKE THE STANCE YOU HAVE THE OPPORTUNITY TO TAKE.

DO IT TODAY. BEFORE IT’S TOO LATE FOR EVEN ONE SMALL BEING.