The function of punishment is to do good, to improve the universe, to add to the sum total of happiness. And punishment which does not do this is not… - J. Howard Moore

Hardships have come. They have come from the inanimate universe in the form of floods, fires, frosts, accidents, diseases, droughts, storms, and the like; from other species, who were competitors or enemies; and from unbrotherly members of the same species. Some have survived, but the great majority have perished. Only a fraction, and generally an appallingly small fraction, of each generation of a species have lived to maturity.

This is the ideal:
Man takes these races from the plains, where they are exposed to hunger and thirst and cold, harassed by enemies, and victimized by their own child-like intelligence. He associates them with himself. He gives them security, shelter, regular food, intellectual surroundings, and a home. They give to him in return the benefits of their superior strength and speed, bearing man and his burdens, wielding his great machines for him, and supplementing in a thousand ways the inadequate powers of their mentor.

I am a vegetarian, therefore, because cannibalism is unnecessary. I can live just as well and be just as happy without drinking the blood of my fellows, and why should I slay them? Why should I not live and let live—especially when I can do it just as well as not? It is not necessary that ten thousand creatures should give up their lives in order that I may keep mine, and if I make any pretensions to morality why should I require them to do it? If you say such a thing is necessary in your case, I say to you it is not—and further, that if it were, it would be your duty as an ethical being to call on your undertaker. There is no sense in carnivora talking about ethics and justice and mercy, for their very existence is a travesty on such things. It makes me indignant and sad when I hear men deplore sin and prate about justice and love and mercy, when the very energy they expend in preaching justice and mercy is obtained from the skeletons and sensibilities of their fellows. It is a spectacle that ought to make the imps of netherdom tremble for their laurels—man, the remorseless glutton, going about with a tongue and a knife, with his tongue preaching peace, mercy, and love, and with his knife making the very earth sodden with blood.