The Church puts morality above physical and mental lifestyles, whereas eugenics puts the physical and mental above morality. A major problem the Church has is that it has already put out helpful doctrines to rid species of what eugenics is attempting to rid them of. For example, for sex and alcohol, the Church has issued the idea of temperance. For disease, it has issued the doctrine of purity. Rather than breed a species to prevent these things, the Church has offered these virtues by which to freely choose them.
When it comes to breeding a certain species, there are two main methods: segregation and sterilization. A newer method of sterilization has abandoned the typical castration and ovary extraction with an easier form. Though the Holy Office of the Church has not given an official ruling on this issue, it conveys that the sterilization of human beings invites an evil worse than the one that is being avoided. It invokes sexual impurity and breaks the bonds of matrimony. Supporting degenerate people, the Church has never issued a ruling that prevents them from getting married.
Some ideas that exist in eugenics coincide with Church teachings. For example, eugenics calls for restricted sexual acts among those not deemed "desirable." This correlates with the idea of celibacy within the Church.
Because eugenics is not as intense and widespread as it once was, the Church does not have to deal with it as much. They have not made a substantial ruling on the issue of eugenics, except for the fact that they do not restrict any two consenting people from marrying as long as they are committed to each other. This principle seems to defeat the more intense forms of eugenics.
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