Improvement (n.) is introduced only by those who can feel that something is not good.
Improvement (n.) applied to men means tamed, weakened, discouraged, made refined, made effete, emasculated, and thus almost the same thing as harmed.
Improvement (n.) of humanity is a zoo word: domesticated beasts are not improved but weakened, made ill through pain, hunger and fear.
Improvement (n.) of man is naively postulated by philosophers; but more virtue may preclude more insight, and virtue has hitherto required misfortune — if you want happiness, perhaps become one of the poor in spirit.
Improvement (n.) of mankind is a concept the priestly species derives from itself, as the norm and high point of man.
Improvement (n.) of man, or "humanization," stands in an extremely dubious relation to the enlargement of the human type — part of the contradiction between every moral and every scientific concept of life.