Many people look upon a rotting carcass with disgust. This is a natural human response, and it is meant to keep us from contracting harmful pathogens. Even though people avoid animal carcasses, other creatures depend entirely on animal cadavers, and play a vital role in decomposing decaying biomass so that it can return to the earth.
Many mammals are scavengers, and quite a lot of the carnivores are scavengers naturally.