The statement about shielding the vulnerable is a naïve one to be honest.
What's a vulnerable person? I have friends who have had cancer - vulnerable. I have a friend who has an immune system problem - vulnerable. I have a child who has a heart condition - vulnerable in most people's eyes but his consultant is happy for him to go to school.
Both my friend's have children, one is a single parent. So, let's take her. What happens to her child? He can't go to school or out anywhere if his mother shields. She has no family in this part of the country and her son's father is in Scotland - she lives in Sussex. Who takes the boy? His father lives with his aged parents (who would have to shield too).
What happens to my friend who is in remission from cancer? Her husband, like her, works. Does he move out with the kids? Who pays for two homes? They're just holding it together with one mortgage and both of them working?
And, assuming my son was a little older and working. He'll always have a heart condition - aged 13, 23, 33 etc., It won't go away or get better. So does he shield? We all pay his rent and benefits? There are many like him - type 1 diabetics (young), kidney problems (young), cancer (young). Not every person who would have to shield is elderly.
And many of those who had to shield last time were children who belong to the same hospital as my heart child. Their parents had to shield too (obviously). Without those parents working (many of whom are in their 30s and 40s), the rent/mortgage does not get paid. So we, the tax payers, have to pay it.
And, of course, we not even adding in the elderly who need help at home. If they shield, who does the care? Or do they go into those magic pop up care homes that don't exist for the duration?
Saying 'the vulnerable can shield' is far, far too simplistic.