Question

Philosophers widely believe that only humans can be moral (or immoral) because of our capacity to _____.

Answer 1

Philosophers widely believe that only humans can be moral (or immoral) because of our capacity to reason.
Given that humans are reasonable animals, meaning that they can use their brain consciously, we are considered to be the only species capable of moral or immoral actions. Other animals, given that they do not exhibit such an action, are incapable of such things.