Proving subjective experiences is pretty tricky indeed. If I were to poke you with a needle, I'd assume your vocalisations and gesticulations meant you experienced suffering, because your behaviours map to what I would do, myself, were I suffering from a needle poke. I can't prove that, however, any more than I can prove a fly suffers.
When it comes to humans, we generally don't worry about that lack of rigorous proof. But why does that generosity extend only to our own kind?
When it comes to humans, we generally don't worry about that lack of rigorous proof. But why does that generosity extend only to our own kind?