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.
لاننا نظن ان الاحجار لن تعاني .. واذا كنا مهتمين أكثر بالقرود مما نحن نهتم بالحشرات فهذا بالتأكيد سببه أننا نظن انهم - القرود - معرضون لمجال اكبر من السعادة والمعاناة المحتملة