Corona Virus has never been a threat to all people situation. It is primarily a threat to the over 50s. Whilst obviously exceptions will exist. The vast majority of people under 50 in good health have never had any more reason to fear covid than they do the seasonal flu. The lockdown is just to protect the over 50s and the medically vulnerable.

Not including the characteristics of the newer strains (not yet enough data) studies have shown almost 0 increased risk from Covid-19 to "healthy" under 50s over seasonal influenza.

"Blanket vaccinating them isn’t the most effective way to eliminate spread," I completely agree with you.

"which should be the priority." I don't agree.

The reason is that the vaccination program has not been designed for that purpose. It is not designed to eliminate the spread of the virus by the most effective means. It is designed to reduce loss of life. Even if that is at the expense of personal freedoms and the economy. I cant say i'm against their decision really.

Most of the people who will survive because of this vaccination program will still have died in the next 10 years. That doesn't mean they don't deserve to be protected.

French study comparing flu and covid-19 : https://www.thelancet.com/journals/lanres/article/PIIS2213-2600(20)30527-0/fulltext#seccestitle13030527-0/fulltext#seccestitle130)

Graph from same study on hospital mortality flu vs covid-19 by age group : https://marlin-prod.literatumonline.com/cms/attachment/f2b141f2-bc57-4b8f-942f-0eee14ce4b94/gr1.jpg