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NZ - Isolated island with relatively small numbers of external visitors
Any government can close borders/implement quarantine though? How quickly and efficiently they do this will inevitably help control the outbreak-South Korea has reduced the new infection numbers to new arrivals for example.
Australia - Low population density
on average, still has densely populated large cities. Also locked down pretty fast.
Bit of an oversimplification
It's a chart with a very limited purpose, designed to communicate an idea. I think it's supposed to be simplified. I don't think anyone is forgetting there are a ton of other factors, but Government response or lack thereof is one that i think everyone can agree is pretty fundamental.
Yes but don't forget that there are a ton of other factors
NZ - Isolated island with relatively small numbers of external visitors
Vietnam - Similarly isolated from global travel, authoritarian Communist government
Australia - Low population density
Bit of an oversimplification but there are always other factors beyond simply government response to things