We definitely need not be more cruel than nature, I think we can agree on that. What Dr. Temple Grandin’s work did was to make animal slaughter less cruel than it was. But, I think we humans kill animals in a more cruel way than nature does. When in the wild animals are hunted they have a chance to escape and live , we on the other hand leave them no choice like that, which is much worse if you think about cruelty not just in the form of physical violence, its a lifetime of torture and imprisonment, So yeah, sorry but we are much below natures standards and I think, we need to keep striving to rise above it rather than using “Naturalistic Fallacy” argument to justify status quo.