It is important to clarify some misconceptions in your question. Narcissists and psychopaths, like all human beings, do have feelings. They may have different emotional experiences and tendencies compared to others, but they still possess a range of emotions. However, it is true that they may struggle with empathy and have difficulty understanding or connecting with the feelings of others.
Nevertheless, using any human, regardless of their psychological characteristics, as livestock for meat production would be unethical and morally unacceptable. Treating individuals as mere commodities or objects goes against fundamental principles of human rights and dignity.
In society, there are laws and ethical guidelines in place to ensure that human rights are respected, and these include the prohibition of using humans as livestock. Instead, ethical considerations and practices aim to ensure the humane treatment of animals and the responsible and sustainable production of meat for those who choose to consume it.
It is essential to foster empathy and compassion for all living beings, promote ethical treatment of animals, and uphold the principles of human dignity in all aspects of life.