I think if you don’t know or understand the rules then the onus is on you to find out. Particularly if you’ve a shielding person in thr house hold.The rules were everywhere. And I mean everywhere, how not one member of that family didn’t see the news, and had no idea he was supposed to shield and no idea they were in tier three and no idea they were only allowed to mix on Xmas day if not shielding, is beyond me
But what’s even more startling is he already had it by the time they went to their elderly mothers house. Catching it was nothing to do with mixing at Xmas. How he caught it I don’t know, maybe one of the kids brought it back, but he already had it before they even went to the mothers house.
They broke all the rules, so why the guardian picked them as an example of the government at fault I don’t know. Because arguably if they had all complied then he wouldnt have caught it. It’s actually an example of “if you’d found out the rules and complied you’d have been safer”.
What happened was terribly sad, but there was absolutely no way to make the rules any more publisced than they were. Other than sending someone round everyone’s home.