three aspects of parenting that I suspect are the main reasons why people choose to have kids or not: the financial case, the moral case, and the practical case

None of these are reasons to choose to have kids; they are all reasons not to. That is, even if you refute them, you still haven't made a positive case.

This brings up the issue of whether or not you "owe" your child an all expenses paid college education. I wouldn't rule out only paying partially for your child's college education especially since this calculation assumes only one child. I would be interested to hear more thoughts on this matter.

I don't feel obligated to provide any college tuition to any of my children; I certainly haven't ruled it out, but to have had their prospective existence hinge on going to a college or not seems to wildly exagerate the importance of a college degree.

I also tend to think the other financial costs of having a child are overblown due to a desire for convenience or status (that is, there are cheaper ways of doing things that may not signal high status, but that is true of everything really)