I wonder if you'd apply the same reasoning to other humans? Or does the 'natural state' of life only matter when it's animals we're talking about?

To be blunt: The natural isn't necessarily good -- the natural isn't necessarily right. This is obvious when it comes to our interactions with other humans. (A lot of classic works of politics, Thomas Hobbes's Leviathan being a paradigm example, have been explicitly about getting us OUT of a 'state of nature'.) But it's also the case when it comes to our interactions with other animals.