2) Defining a class of humans as "subhuman" was a root cause
3) We currently define a "fetus" as subhuman, based on an arbitrary date (third trimester, etc.)
4) Pick a date (8 months, eg)
5) My son (Chris, currently a greenbelt, IQ 150+) was born at less than 8 months. Pick another.
6) Late the liberal date picked = N. Why was the child a child on N, and not on N-1?
7) QED, No date can be picked. 8) So we have to find another criteria - brain activity, or some such.
It's a start.