First, in our culture people are prone to attend more to feelings about morality rather than reflective thought about morality, and this can have harmful personal, social, and political consequences. I might feel strongly that I am justified in responding in anger to what someone has said or done, but I may be wrong about this. Acting out of the emotion might damage a relationship, perhaps in deep ways. Or I might feel that something is wrong, but this could be grounded in something besides the truth. Feelings are important and perhaps contain value judgments, but they are no substitute for rational reflection. We depend too much on our guts, rather than our minds, when dealing with ethics.
Second, some of life's most interesting and important questions are moral questions--abortion, euthanasia, affirmative action, the duties of parents, the definition of true happiness, and the nature of virtue, to name a few--and if we want to live good lives as individuals and as communities, we ought to reflect on such issues in order to apply the fruit of our reflections to our lives. This is why an education (both formal and informal) in the humanities is important, as it can help us in these and other ways.