"If they have their way, what is to become of faithful Catholics, who" think that sexism is just peaching-keen? Because that is the actual reason for not ordaining women. They used to be open about it. For example, Thomas Aquinas, in the Summa Theologica Supplement, q 39 art 1 considers the question, "Whether the female sex is an impediment to receiving Orders?". He says that it is, for two reasons. The first is that women are inferior to men: "since it is not possible in the female sex to signify eminence of degree, for a woman is in the state of subjection, it follows that she cannot receive the sacrament of Orders". (The second reason is that the tonsure is not appropriate for women.)

Now, they try to pretty it up with words like "complementarity" and "ontological differences", but "inferior" is what they really mean.