Earlier quoted context omitted.
>That mismatch requires justification. Only when looking through the lens of fringe ideologies. The overwhelming majority of humans don't subscribe to moral ideologies that ascribe equivalent moral standing to humans and nonhuman animals.
It also took quite a while for people to come up with the concept of universal human rights, we're still bad at overcoming tribalism, and basing morality on majority vote isn't necessarily the best idea. That aside, you're right that I also do not assign equal moral standing to humans and nonhumans. However, that does not mean that the same arguments that make me reject culling humans don't also apply to other animal…
It isn't an idea; it's a reality. Establishing any sort of standard for moral behavior is necessarily an exercise in consensus-building.