Consequently, it is moral to do the same.

The argument that animals kill out of necessity while we have the option to eat vegetarian food is contradicted by the behaviour of animals that don't kill for food.

From a National Geographic Special on Dolphins: "But beneath the harmony lies a darker side of dolphins. Gangs of strong males pick on younger or smaller dolphins. Bottlenose dolphins are even known to kill for reasons other than hunger.

Source 1.

Their reasons for such killings have long been a source of debate among zoologists, but the aftermath of the Ngogo murders reveals an important clue. After the chimps picked off their neighbours, they eventually took over their territory. It seems that chimps kill for land.

Source 2.

Our moral beliefs should value society's well-being. Killing animals feeds people, thus benefiting society.