St. Thomas gives a classic pro-life argument.

[Daniel]

What does that have to do with eugenics? Either you're using the word "eugenics" rather loosely, or else I'm missing something. Because I've always heard "eugenics" used basically in the sense of "selective breeding" applied to human populations--more or less the unnatural attempt to "purify" the human gene pool by ensuring that undesirable persons (or, at least persons with undesirable genes) don't continue passing their genes on to the next generation.

[Philip G.]

It is known as shock and awe.

Shock the person with a revolting statement such as "a wife is bound by divine law to have sex with her husband infected with contagious leprosy in turn contracting leprosy herself to pass it onto their resulting offspring". 

Awe them with a statement like "and though the child begotten of them be diseased, it is better to be thus than not at all", to display displaced/extreme/false charity. 

According to Michael Hoffman, this is shekhinah.  And, this is not the only example one can find in Aquinas' work. 

[Geremia]

What does that have to do with eugenics?

What do you understand Pope Pius XI to mean by eugenics in what I quoted from Casti Connubii?

[Geremia]

It is known as shock and awe.

No, it's not a pathetic argument.

Shock the person with a revolting statement such as "a wife is bound by divine law to have sex with her husband infected with contagious leprosy in turn contracting leprosy herself to pass it onto their resulting offspring". 

Awe them with a statement like "and though the child begotten of them be diseased, it is better to be thus than not at all", to display displaced/extreme/false charity.

"displaced/extreme/false charity"?

[Philip G.]

It is known as shock and awe.

No, it's not a pathetic argument.

Shock the person with a revolting statement such as "a wife is bound by divine law to have sex with her husband infected with contagious leprosy in turn contracting leprosy herself to pass it onto their resulting offspring". 

Awe them with a statement like "and though the child begotten of them be diseased, it is better to be thus than not at all", to display displaced/extreme/false charity.

"displaced/extreme/false charity"?

John 15,13 "greater love than this no man hath, to lay down his life for his friends".  It is the sin of presumption to believe that heathens will lay down their lives for their enemies.  To use such false charity as a premise in his argument is pathetic.  Leprosy will make an enemy of a friend real fast.  Imagine being born that way.   

The same goes for Aquinas' other false premise in this argument; which is that the marital debt knows no bounds.  He does so by ordering the marriage debt supreme.  But, matrimony knows bounds by its mean.  The sexual act is stained by original sin.  It knows bounds by its end.  The catholic family is to produce at its pinnacle religious vocations, for that is what Mary did.  And, Mary is the model.  Christ is the unblemished lamb that was sacrificed.  A leper from birth is neither.  Sacramental marriage knows bounds. 

[Gardener]

I think it would help if you didn't speak in what are almost veritable riddles, Phil.