People tend to think of objects and living things as having a soul or not having a soul when really it’s a continuous scale of souledness. For example, people reject the idea of eating certain animals like cats but not chickens, we remark about how, after a major cognitive decline due to old age, that person “isn’t all there”. There is a continuous assignment we make as to the degree of souledness in everything we see and interact with.
This isn’t to say this is correct (a souledness scale points out a lot of inconsistencies and contradictions) but it provides a good explanation for the moral issues we face today—a binary view of souledness (the predominant view) requires consensus and is therefore indeterminable.
From I Am a Strange Loop.