The most common description of utilitarianism concerns the welfare of sentient beings, those who are capable of pain and pleasure, in some cases even nonhumans. This description is why, in modern times, utilitarianism has been used in discussions about the suffering of nonhuman animals and ethical aspects involved in the production of food-producing animals.
According to Kant, the maximization of the good for those involved, the basic premise of utilitarianism with regard to moral action in society, is irrelevant from the point of view of those individuals concerned with the maximization of the good, or the positive outcome of their actions. actions, only for themselves, without caring about other people.
Deontological Ethics is a treatise on duties and morals. It is a theory about the choices of individuals, which is morally necessary and serves to guide what really should be done.