Why are their vaccination rates so low? I understand their strategy in terms of using their isolation as a strength here but I can’t imagine it’s scalable after

Why are their vaccination rates so low? I understand their strategy in terms of using their isolation as a strength here but I can’t imagine it’s scalable after awhile. Was there apprehension to get vaccinated or did their government fail to acquire supplies? I would imagine New Zealand would have no difficulty in getting supplies by June or so but perhaps I’m wrong. Israel for example is similar in terms of GDP per capita and they are well ahead.