Viability is subject to current technology. The question, "When can a baby survive outside the womb?" and "When is a fetus considered a human life?" are not synonymous.
Using viability does not answer the question, "When does life begin?" If a baby is born full-term with a birth defect and dies shortly after severing the umbilical, was it ever alive? It's an absurd question, of course it was, but it illustrates the problem of considering "viability" a benchmark for abortion.
Viability is already the benchmark for abortion, Roe v Wade states that viability is the "interim point at which the fetus becomes ... potentially able to live outside the mother's womb, albeit with artificial aid"
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