People eat chimpanzees for the same reasons people eat cows. I
know it's strange in western culture but chimpanzee's are animals,
some cultures need to eat them to provide the nutrients they need
in their diets.
Religion and culture will play a charge part in the food that
people eat ever day. Some people can't eat some foods because of
their religion for example Muslim and Jews can't eat pork, Hindus
don't eat beef and Buddhists are vegetarian