This is pretty typical example of a case where people keep hoping there would be a clear, logical reasoning on which they could base their moral intuition on. Unfortunately, it's not going to stay arbitrary. On the one end, there's a bunch of cells, on the other, there's a baby. The point where that changes is indefinable, so we all have to make our own decisions, using what logics are intuitive to us.
This is also pretty much why I am pro-choice, to a point. (Which I think is mostly somewhere around 22 weeks.) Trying to force arbitrary moral values like this upon others does not lead to good things.
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