> The ability or non ability to alternatively source organs doesn't logically lead to a change in consequence.
But your analogy doesn't capture the responsibility of the donor for willfully creating the circumstances in which the recipient needs a kidney. Moreover, abortion is a procedure which actively kills a child which would likely otherwise live (without intervention); your analogy supposes a person who would naturally die without intervention. I'm sure we could contort your analogy to make it account for these things, but doing so would exhaust its utility.
At this point we've added mode of consequence to the analogy, but it seems you're introducing yet another constraint: active and passive intervention. I'm afraid I'll have to stop this here. It appears as though you will continue adding complexity until with the intention of forcing your result. Sorry, I don't debate with people acting in bad faith.
If you're really deeply committed to this analogy, we would have to suppose a world in which everyone knows that voluntary sex produces children with an organ deficiency which can only be satisfied by a donation from one parent.
> At this point we've added mode of consequence to the analogy, but it seems you're introducing yet another constraint: active and passive intervention. I'm afraid I'll have to stop this here. It appears as though you will continue adding complexity until with the intention of forcing your result. Sorry, I don't debate with people acting in bad faith.
Pointing out that your analogy fails to capture the relevant dynamics isn't "acting in bad faith".
EDIT: Removed some snark.