But you already condone the system by living in the United States under its laws. There is nothing in Catholic moral law which requires that one take no action to save any lives unless all lives can be saved.
I likewise view divorce as a great evil. No-fault divorce has destroyed families and the lives of countless children.
I favor a return to the previous laws requiring sufficient grounds for divorce. But there is no moral requirement for me to settle for nothing less than full imposition of Catholic marital law.
First of all, you are assuming that I live in the USA.
Second of all, you are assuming that if I live in the USA I condone its laws. And that is just not true. The Church teaches that we are not required to comply with unjust laws, and more than that, as Catholics we are required to not comply with unjust laws.
The reason you are going against Church teaching is that your proposal uses evil means (the accepted murder of the unborn who are conceived via rape) to achieve a good ends. That is not acceptable.
CCC 1753:
A good intention (for example, helping one’s neighbor) does not make behavior that is intrinsically disordered, such as lying and calumny, good or just. The end does not justify the means. Thus the condemnation of an innocent person cannot be justified as a legitimate means of saving the nation.
----Who is more innocent than an unborn child, including one who is conceived via rape?
CCC 1756:
It is therefore an error to judge the morality of human acts by considering only the intention that inspires them or the circumstances (environment, social pressure, duress or emergency, etc.) which supply their context. There are acts which, in and of themselves, independently of circumstances and intentions, are always gravely illicit by reason of their object; such as blasphemy and perjury,
murder and adultery.
One may not do evil so that good may result from it.
[bolding mine]
----Allowing the murder of the unborn who are conceived via rape is evil. It is against Church teaching to do evil so that good may result from it.
CCC 2270:
Human life must be respected and protected absolutely from the moment of conception. From the first moment of his existence, a human being must be recognized as having the rights of a person - among which is the inviolable right of every innocent being to life.
----Aborting a human being who was conceived via rape is not protecting her.
CCC 2271:
Since the first century the Church has affirmed the moral evil of every procured abortion. This teaching has not changed and remains unchangeable.** Direct abortion, that is to say, abortion willed either as an end or a means, is gravely contrary to the moral law.**
[bolding mine]
----Allowing the abortion of a child conceived via rape is gravely contrary to the moral law.
Your proposal is just not acceptable.
*Holy Mother, please keep
all unborn children safe tonight.
St. Francis, please pray for all unwanted and hurt animals.
Lord, please help me accept persecution from a fellow Catholic who believes I am a hypocrite for praying to St. Francis, a saint alive in you. Please help me to be strong and to not bow down to pressure from those who will not see Truth.*