This actually doesn't make any sense.
How is everyone staying at home and being in lockdown protecting 'the shielded'?
The people shielding haven't been leaving their houses, that's how they are being protected. What everyone else is doing makes no difference to people shielding, they (people shielding) are in their homes protecting themselves.
The lockdown was implemented to stop the NHS being overwhelmed by too many cases of Covid19 because the government didn't know, when this started, how many people would need to be treated in hospital or how severely the virus would affect the general population, which is why the Nightingale hospitals were put in place.
As it turned out a lot of people didn't need to be hospitalised.
Clearly there are some hard of thinking people out there looking to blame someone for their misfortune at the hands of this disease and have decided to lay the blame at the door of people shielding.
I despair of society sometimes.
Fortunately, I don't know anyone who thinks like this.
'Stay home, Protect the NHS, Save lives'. No mention of 'the shielding'.