Everyone agrees it would be a good thing if fewer children were born into poverty (and more born into financial security). The ideal way to achieve this would be for no-one to be in poverty to begin with. That would help the older generation as well as the new. But the benefit to the new generation could also be achieved by another route: namely, by poor people having fewer children, and financially secure people having more children.
That's clearly an inherently desirable outcome (pro tanto, at least -- and 'all things considered' if it is achieved by morally permissible means, e.g. the voluntary choices of all involved). But I suspect many people would not be willing to actually admit this -- perhaps due to the perceived association with eugenicists and other "unsavoury" types. (But remember, Hitler was a vegetarian!)
Anyway, I was struck by this the other day in class when we were discussing an author who claimed the following asymmetry: that although there's some (epistemic) chance that in having an abortion we violate weighty moral reasons, supposedly nobody thinks there's any such moral risk involved in carrying a child to term (at least excepting rare cases of severe disability, such that the child's life would be utterly miserable).
I find it interesting that most people seemed willing to accept this claim without a second thought. Because it seems to me very obviously false. We have pressing moral reasons to increase the average quality of life of future generations. And one way to achieve that is for people in less fortunate circumstances to bring fewer children into those circumstances. This will help bring about less poverty, crime, etc., and that is surely a very good thing indeed.
(To preempt any misunderstandings, I'm not suggesting that abortion is obligatory. It would certainly be inappropriate to demand this choice, or to censure poor women who have many children despite the evidence that they will have worse-than-average lives. That's their business, not anyone else's. But insofar as they are trying to decide for themselves what to do about their pregnancy, I think in many circumstances -- e.g. so long as it wouldn't be traumatic for them or anything -- it really would be best were they to abort.)