Second, You can't see how (supporting) forcing a rape victim to give birth against her will...is not forced punishment, times two?
That's like talking about forcing someone to digest food that he ate earlier (either willingly or unwillingly). You're confusing acting and not acting.
It would be as though you forced me to eat a hamburger, and I complained that a doctor was forcing me to digest the hamburger by refusing to pump my stomach of its contents.
Er...
no. The doctor isn't acting. He's refusing to act. I'm not being forced to digest anything (except, of course, to the extent that I was forced to eat the hamburger in the first place). The digestion is happening of its own accord.
What has to happen for the rape victim to give birth? I.e., what human intervention is necessary in order for the pregnancy to come to term?
None. It happens on its own.
To speak of "forcing" someone to give birth is just a sophistical/rhetorical flourish with no grounding in reality.