english: It's because we don't think rocks can suffer. And if we're more concerned about our fellow primates than we are about insects, as indeed we are, it's because we think they're exposed to a greater range of potential happiness and suffering.
non_english: Omdat we denken dat stenen niet kunnen lijden. We maken ons meer zorgen maken over onze medeprimaten dan over insecten omdat we denken dat ze gevoeliger zijn voor mogelijk geluk en lijden.