“If it is once accepted that people have the right to kill ‘unproductive’ fellow humans....”
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Then what about the incorrigible criminals in jail who are a financial burden to society and the law-abiding citizens?
Will they be euthanized?
"Viability" is still another moving attribute, and ridiculous since even the Spartans knew a new-born child was no more viable, when exposed on a hill-top, than an unborn child.
These are reasons for opposing abortion as a government-issued "right," most especially something sponsored by the state. Law and government extend their least efforts on behalf of constituencies with the least political clout. And there is no human assembly with less clout than the unborn.
If abortion is not infanticide, what is it? By what measure can any legislature determine a single child's value? If viability is ruled out, on its face, then at what point in a pregnancy is abortion proper?
As medical technology has marched on, eventually every conception will be supportable, and every child conceived could theoretically be brought to term, beyond even the womb.
The Right to Life is not a mere slogan, it is the reason for being of the American government, even if, like all aging institutions, self-continuity inevitably eclipses everything and becomes that government's reason for being.
Any American legislature that institutionalizes a transitory majority's arbitrary standard and deprives any of its citizens of their right to life without due process has become destructive of its reason for existence.
God help that People who have made an idol of themselves and their governments, those who have substituted even a dysfunctional extended family with the clumsy colossus of government, setting loose cattle to trod the grapes.