Of course, no conscience, no choices, no responsibilities, no agony, no ecstasy, nobody needs psychologists. Or alternatively, the traditional human being, who is definitely flawed but exists in a moral context and is the subject of things like Shakespearean drama. I suppose the most popular one is that if I'm a moral absolutist, I'm going to be unhappy. I'm going to feel guilty. I'm not going to have self-esteem.
Happiness is the one thing everybody wants all the time.
And there are some very unhappy moral absolutists. They are, I suppose, a more effective bad press for moral absolutism than the happy moral absolutists are good press for it. The Catholic Church will not canonize a saint unless not only heroic virtue but heroic joy is found. That's one of the fruits of the Spirit. You regard holiness as the cure for moral relativism.