You're answering a different question, which is "why do humans empathize with non-humans?" Humans can empathize with inanimate objects and with fictional people. The question of the origin of empathy really has nothing to do with what I asked.
I think I do answered your question but maybe it was too implicit, so let me be more explicit. A human should have moral responsibility towards non-humans because of empathy and recognizing the fact that other animals are alive as well.
I think I do answered your question but maybe it was too implicit, so let me be more explicit. A human should have moral responsibility towards non-humans because of empathy and recognizing the fact that other animals are alive as well.