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It's just as easy to imagine yourself living as a blade of grass as it is living as another human?

The line between humans and other species doesn't seem that arbitrary.

You don't have to imagine. You have to consider for fairness. This argument is usually attributed to Rawls. He wrote extensively about it in his A Theory of Justice (1971).

> This argument is usually attributed to Rawls. He wrote extensively about it in his A Theory of Justice (1971).

Bingo! I didn't mention it in my original comment, partially because I was interested if anyone would spot it.

(And partially because it wasn't per se relevant to the argument itself)

Human rights apply to farm animals now? :)