Empathy is a human trait. But lots of humans exercise some traits more energetically than others. By "the usefulness of empathy" I mean the way in which a progressive might claim that empathy is a crucial aspect of any benign political system, and the way a conservative might argue that not only is it not necessary, but it might not even be all that helpful, in that regard.
In my view you cannot claim to have seen something until you have photographed it.