Why can't forced Birthers understand that abortion is not murder?

Under US federal law abortion is not defined as murder, it is defined as a legal medical procedure and please don't come at me with saying, "well slavery was legal", because like abortion, slavery was seen as a states rights issue until the pro-slavery side forced the federal government to pass the fugitive slave act to force abolitionist states to send the runaway slaves back to their owners just like how you forced the government to not recognize abortion as a constitutional right.

Why can't forced Birthers understand that abortion is not murder?
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