you either believe in rights or you don't.
And abortions are not "universally understood to be reprehensible".
Only a minority of the country believes that abortion is universally reprehensible, and the rest draw various lines between "universally" and "never".
The country is very divided on the morality of abortion.
The country is not very divided on the morality of shooting up a WalMart.
Some abortions. Late term, say.
Not even close.
20 ish percent believe abortion should be legal under all circumstances.
IDK what the approval rate is for shooting up WalMarts, but probably a lot closer to 0 than 20...