IOW: When they are an immediate threat to your life and the only way to defend yourself is to kill them first.
However, if you added rape I would not refuse to back the bill. I would wait for another day to prove that killing the child conceived in rape does not unrape the mother.
So well stated that I think it bears repeating! The rape issue is a difficult one, but you're certainly correct with the "unrape" concept.
I'd like to take credit, but it actually comes from an old joke about the difference between pregnant women and light bulbs.
That said, there are women who have aborted the children conceived in rape who will tell you their unfortunate discovery. It seems that two wrongs, indeed, do not make a right.
However, I think three rights make a left.
Shalom.