"The idea that literature should be written to benefit nonhumans is new. We see no hint of this in western letters prior to now. Book X of The Republic maintains that the only permissible literature is that which praises gods and famous men. Aristotle remarks in Book IV of The Poetics that literature’s purview is the imitation of the actions of men and gods. Sidney’s Defence holds that literature’s purpose is to improve the character of a gentleman. Shelley, Lessing, Schiller all declared that the intent of literature should be to improve humanity. In fact it’s been a broadscale and sustained note since the advent of humanism: the project of literature is humanity’s improvement. Full stop.
Writing literature for the improvement and benefit of nonhumans isn’t some boutique issue, especially when we consider how animal farming is altering our climate and damaging our health and environment. Even for those who cannot intrinsically value nonhumans as ends in themselves, they should recognize that our fate is bound up firmly with their well-being.
A human future that does not acknowledge the injustices done to nonhumans cannot be rosy. Thankfully, a growing body of thinkers, literary and non-literary alike, is increasingly in agreement with political theorist John Sanbonmatsu who writes,
'A Left or socialist politics which does not place our enslavement of other beings at its center, conceptually and politically, cannot possibly succeed: 'speciesism' is not merely one more 'ism,' but in fact lies at the root of every form of social domination.'"