Air New Zealand overwhelmingly operate international flights out of Auckland. British Airways operate predominantly out of London. Air France out of Paris. Etc, etc.
Do the residents of Christchurch, Wellington, Manchester, Liverpool, Marseille, Lyon, etc, etc, bitch and moan that their national carrier is trying to screw then over??
You could fit all of those cities within spitting distance of SY.
Explain why QF flies, or did fly, to more than one destination in the US and little old NZ.