[notacoward]

> Everyone believes that the start of human life is a core issue.

"Core" does not have a clear meaning here, so let's be more precise: everyone agrees it's an important issue, but not everyone agrees it's a decisive issue. Many pro-choice people believe that no person has a right to demand part of someone else's body for themselves, so even if a fetus is a person the mother still has the right to remove it. Comparisons to the illegality of forced organ donation are often made here.

Note that I'm not taking a position here. I'm just explaining a position many hold. To the extent that you ascribe a different reasoning/motivation to pro-choice folks, I think your "everyone believes" is not a valid axiom. Whether intentionally or not, it comes across more as an appeal to (questionable) popularity, and pretty much make Mezzie's point about how impossible it is to talk about this.