Exactly.
The question of OP -When does life begin?- is not a biological one, but rather linguistic, political, cultural, philosophical, ethical, namely an "arbitrary" approach. It requires some agreement on what we understand from "Life" in the first place.
Certainly it can be handled biologically - there's no reason at all to muddy the waters and perspective by dragging in politics, etc. It's a simple, direct question that can be treated scientifically without all the distortions, preconceptions, agendas, bias, etc. that you are suggesting here.