>There is no responsibility or obligation to one's ancestors to have children
I think it's probably a philosophical, maybe even a spiritual argument. Enlightenment individualism has ingrained in western cultures the idea they have no connection or ties to the past, or their ancestors, and shouldn't even conceive of themselves in terms of these other people. Blank slate, complete autonomy, etc. I think it's just a fundamental philosophical disagreement to start from a different premise that isn't self interest per se.
"Lack of choice", I like that. It removes the consideration to construct arguments about self-interested "choice".
I'll make a logical one though:
Every single person's existence is the sum total of all previous generations of ancestors action of making the choice that led to you. Not just one or a few of your ancestor's, but all of them are owed this choice. Maybe even this choice is owed to the universe (~God) itself?
The evolutionary "winners" will be the ones that consistently take this action. You can simply say, are you evolutionarily a winner, or a loser? Will you continue the propagation of your genes, or won't you? This is the "forest for the trees" way to frame it, I believe, as it steps back to avoid endless lower-level convenience rationales for opting out (if the choice is available to you of course).