Certain debates prompt a certain article from the Huffington Post to make the rounds again. Sometimes it’s gun control; sometimes it’s health care. At this point people have mostly given up on linking to the article, preferring to state the headline and move on:
Usually this comes from liberal spheres. On the occasion a leftist voice can be heard, sometimes a leftist will deal with the bad taste of Huffington Post long enough to repeat the line. That both of these types tend to respect expertise (or at least pay lip service to it) makes their lack of turning to the relevant experts rather odd. There are, after all, plenty of people who do know how to explain why you should care about other people. (Or, at least they claim to. I don’t think they succeed. But I’d certainly turn to at least a few moral philosophers before declaring the project impossible.)
Perhaps there’s really two problems one of these people might be having. The first is a lack of understanding why they should care about other people themselves. They find it basically aesthetically pleasing when people show care for other people, but their taste is fundamental. They cannot explain it to someone else because they have no explanation besides claiming it as a brute fact.
The second is a pedagogical problem. Even if Kant’s Metaphysics of Morals does successfully explain why you should care about other people, whipping a copy of it at a nearby person who doesn’t care about other people is unlikely to persuade them. If any moral philosophy is right, it’s probably right in a way that’s difficult to understand. Most people are not well-equipped to impart the arguments to others. But then, that’s usually the result of not having much of an argument for it for themselves. So the problem is probably the first in most cases.
But if there’s no reason to care, then demanding anyone else abide by your arbitrary maxim is absurd. “I don’t know how to explain to you that you should care about the rights of grass” sounds silly. Vegans often do know how to explain to you that you should care about animals. Perhaps this is just an accident of their coming to veganism from a position of non-veganism. The arguments don’t always persuade, but they are at least better than throwing their arms up and saying “I don’t know how to explain to you that you should care about animals.”