We are from NZ. They aren't. That is the only reason.
Without getting into paranoia territory, I think what we are seeing with the "FFA vs The Nix" is a hardnose business tactic by FFA falling on a fertile ground of a changed Australian psyche. Changed from what it used to be just 10 years ago - it is now clearly more insular, xenophobic, and parochial.
Those over in the West Island who have a sympathetic view towards the Nix probably do so despite us being a club in NZ, and like us because we are a good club adding value to the football "experience" in HAL. Those who are keen to see us go do so despite us being a stable and well-run club, and would like us to go because we are a club in NZ.