Re herd immunity
The idea seems to be that people catch a disease and then develop immunity to it in the community, and then the disease dies off and becomes less important.
However, if this were the general rule, we wouldn't need vaccinations. Vaccinations were developed, because herd immunity generally doesn't just develop like that on its own.
Before we had vaccinations, quarantine was the big development that helped reduce the impact of plague episodes.
"Just let everyone get it and hope for the best" is not a recipe for successful management of episodes of infectious diseases.
If you have a business, you need customers who are healthy enough to come and buy your stuff, maybe with enough confidence to go onto your premises.
So we need a well organised society that can protect your more vulnerable customers (as your consumers) and also that will allow your employees to get to work safely and where the hospitals, finance systems, emergency services and of course schools can open safely.
If we are ingenious, then we can balance opening up with safety,but I think mitigation measures are inevitably part of the equation, to balance social mixing and preserving the fabric of society.
I think we need to prioritise where we put our energy. Education is hugely important, we can balance safely distanced or online tutorials with on line lectures. If students need to quarantine, then can there not be a business case for getting food and other supplies to them in an effective way. Also people will want nice things and fun experiences at Christmas, even if it's not a normal Christmas, and there will be business opportunities in that. And so on.
As a vulnerable person, I am fine with effectively shielding for another 18 months or so, but I think there should be an element of choice in this because of people's different circumstances.
I also hope that we might get some roaring twenties action after this is over, as people make up for a difficult year or 2.