As @tdgeek said, not easy. I can see this both ways.
You've gone overseas for whatever reason (greener pastures), you've not contributed to NZ, why should the country you left pick up your bill? Vs
You are a New Zealander and will always be a part of this country (entitled to come here), and this is an important public health measure and not something done for your own benefit.
What about people coming for funerals who will go again afterwards? Should they pay? My gut feel says maybe they should, but then again it's not their fault a relative died during a pandemic and adding yet more cost won't help them. Then again, why do the rest of us have to suffer financially (after all it's not our fault your relative died during a pandemic).
Not easy at all, and quite frankly I don't actually know what my opinion is on it.