The reason for practicing meditation and seeking to attain samadhi is to escape from the suffering of life. But in seeking to escape from suffering ourselves, why should we inflict it upon others? Unless we can control our minds, so that even the thought of brutal unkindness and killing is abhorrent, we will never be able to escape from bondage to suffering.
After my parinirvana in the last kalpa, different kinds of ghosts will be encountered everywhere, deceiving people, and teaching that they can eat meat and still attain enlightenment. How can one who hopes to become a deliverer of others, himself be living on the flesh of other sentient beings?
―Buddha Shakyamuni, Surangama Sutra