In the article Senator Johnson says there is no reason for him to be vaccinated because he had covid last year. Prof Neil Ferguson is much quoted in the Uk as an expert on covid and what to do, and nowadays rather tends to follow the government line in public statements. He was an original member of the Sage team of government advisors, but was forced to resign when after having had covid himself, he visited his girlfriend against regulations. He stated in his defence that since he had had it already, there was no risk to anyone wherever he went.
Johnson says there is no reason for younger people to be vaccinated because thay are at negligible personal risk. He is right in that one too.
The argument for vaccinating everyone is to create herd immunity. Which is when so many people are immune the virus just dies out because it cannot find new people to infect. The idea is that it cannot then reach anyone who has not been vaccinated, because it cannot reach anyone. The flaw of course is that if everyone at risk has been vaccinated, then what is the problem.
The problem I see about trying to create herd immunity is that it is not how the human immune system is designed to work to best protect us. It creates a broad immunity to different targets within an invading organism which are milder than a vaccine seeks to create, but because they attack many targets are more likely to continue to work if the organism mutates. Then, because the defnce is milder it still allows mall infections to take place: when one does the immune system can update its defences naturally against any significant changes. the goal is so we are never surprised by a completely unknown strain attacking us and causing mass death.
Covid did not cause mass death beause we already had immunity, and that is because of our broad strategy against invading organisms. We were protected because covid is similar to other corona viruses which circulate in society. that saved us.
Now the plan is to try to eradicate covid. It wont work. it just means covid wil hide out somewhere until it makes enough mutations to come back hard, once it has overcome the deep but limited narrow protection this bunch of vccines has been designed to create.
The vaccines are designed to give complete protection until they fail, and then you have to buy a new one. The human system is designed to ensure we never need medical intervention but also never get more sick than annual colds. Our overall immune situation is probably somewhat worse now than 1.5 years ago, even for people who have had covid and so boosted themselve against that one. Because we have deliberately halted the natual process which protects us from all comers.
For some illnesses where the organism hardly mutates much at all, it is possible to create herd immunity. But for viruses it isnt. they change too fast.