There seems to be a bit of misunderstanding about the term "herd immunity".
The original idea was based on the metaphor of gazelles grazing on grass.
Gather together in a group and most of you will survive when a lion attacks.
Unfortunately, in the case of an airborne virus a better metaphor is the ball of fish that get gobbled by a shiver of sharks.
In the end they all get eaten.
Countries like Australia where health care is completely free have a specific problem of limited health resources that are divided according to need not wealth.
This means that if some of the fish decide not to wear shark-proof mesh because they know better, then they will be more likely to get savaged by the virus.
They will then consume resources that may otherwise be used by the mesh-wearing fish that suffer a heart attack or fractured fin.
This is real problem because there are now about 5000 people in hospital in Australia
which is about 10% of all public hospital beds.
These people are disproportionately unvaccinated.
They are gluing up the works and blocking so-called "elective surgery".
Elective surgery is not liposuction or tummy tucks.
Elective surgery is anything that can be put off for a week or more - including some cancer treatments.
Ok, chew gum, wear lycra or watch television - I don't care; but if you want to enjoy the hospitals and roads everyone contributes to get vaccinated and wear a seat-belt.