Should there have been an Alpha Centauri character in this?

Part of the artistic point of this movie seems to be the dystopian portrayal of a totalitarian, jingoistic police state. But given the humanity-fighting-for-survival setup we're given (relentless air strikes against civilian populations by an alien race with superior technology), a seige mentality and military dictatorship almost seems like a rational response, even if one of the side effects is a refugee class who live outside the dome due to resource constraints (not enough/big enough domes, even hospital space for injured soldiers was in short supply).

I wonder if the presence of some kind of sympathetic portrayal of an Alpha Centauri character revealing Earth attacked first or representing some kind of political resistance internal to the Alpha Centauri world, etc. would have added anything or at least made the Earth government actions seem less an act of overt desperation and more driven by a desire to cover up their culpability in the war.

It wouldn't be necesssary for the AC character to know the replicant identities, but they could have been either turncoats helping identify the replicants as a means of resistance against AC's government or double-triple (how many twists do you want) agents whose true motivation is uncertain until the end.