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I think the primary reason, other than population density, NSW and VIC have the large outbreak is because these two states have accepted international flights with a very broken hotel quarantine system. The other states have been a lot more cautious, but I fear once they led down the gates, vaccinated or not, delta will spread.
Lewis, I mostly agree with what you have written, but hasten to point out that the latest research paper (that I heard about from Norman Swan on Coronacast towards the end of last week) actually showed that delta is somewhat more lethal than the original covid-19. I do agree that most viruses will mutate towards being less lethal, but that is not a given, especially in a virus that spreads easily before symptoms arise. Once the spread happens the virus has been successful and there is no evolutionary pressure for the virus to become less lethal; it can just as easily become more lethal. It is just all chance.
Peter
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