Exactly, the "dry tinder" has been burned. Sounds insensitive to say it that way, but by the time the "3rd wave" rolls around, many of the people seriously at risk have already been exposed, especially in the small, densely populated places that are being discussed. It can be spun to appear to be solely because of the vaccines, but it isn't solely because of them at all. A certain level of herd immunity was achieved before vaccines were administered at all. Vaccines (pre-treatments) are having some effect surely, but not the only effect.
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