Ballet is in the same category as art and classical literature, it’s a celebration of beauty and art. Therefore it is certainly not prohibited to Catholics unless it is an occasion of sin for a particular individual. The same reason as classical literature is taught to Catholics even though some of it contains immorality. Would you ban teaching Shakespeare? 🤣I got this from an SSPX priest.
You fail to understand that since original sin, the human body although objectively innocent, even in the nude, is a grave occasion of mortal sin on account of the lower passions of man no longer being subject to his reasoning powers. Modesty is also a natural virtue, which even the pagans of ancient Rome valued, and so it is common sense for a woman to keep her body hidden from the eyes of men, regardless of the circuмstances; desiring an entertaining show in the theatre does not render the exposure innocent.
Pope Pius XI condemned the public exhibition of women in sports in the 1920s, how much more would he condemn the public exhibition of a woman's body in ballet? She may as well be a prostitute with the immodest clothing that they wear, and the immodest movements.
There is a difference between speaking about immorality and condemning it, as this is the case in Shakespeare and even in Sacred Scripture, and glorifying immorality. Ballet glorifies immorality.