I'm often surprised by how uninterested many people are in ethics, especially people who don't look much to religion as a source of morality. An obvious response could be that moral philosophers are not better than the rest of us. But moral evaluation plays such a large part in general pubic life. We all have opinions on the war in Iraq, Zimbabwe and especially global warming, but most of us couldn't identify a branch of moral philosophy beyond suggesting utilitarianism (not by that name) or the golden rule.
One explanation is that we don't much care, which I buy.