Unless your core emotional desires just happen to flawlessly, without a single exception, line up with a comprehensive and consistent ethical worldview, then at

Unless your core emotional desires just happen to flawlessly, without a single exception, line up with a comprehensive and consistent ethical worldview, then at least every once and awhile you’ll not want to do something when you ethically should do it, and want to do something that will cause more than nominal harm to someone else. Also every now and again you’ll have to realize that your ability to predict the outcome of your actions is imperfect. If you happen to be like every other person that has ever existed on this planet, possibly excepting Siddhartha Gautama and Jesus H. Christ, you’ll have to sort out the places where your instincts and desires depart from what’s ethical and make value judgments.