If other countries had done as well as NZ delta would have never spread in the first place. Attributing NZs failure to how they handled things so far is misrepresentation, they did things by the book, but if other countries keep sending the equivalent of typhoid Mary's into the NZ population then it is a matter of time before the strategy will fail.

If NZ would have kept their borders locked this would have not happened. They will come to regret that decision.