It’s certainly true that most transmission occurs within households Greeneyedgirl , I’m not disputing that. But if you don’t have COVID, you can’t pass it on, and statistically the majority of the population do not have COVID and so aren’t able to infect anyone.
For example: in my town last week, just under 200 people tested positive. The WHO estimates that up to 80% of cases are mild or asymptomatic so that would make potentially 1000 cases. Even if the figures are way off and we multiply that by 10, saying my town had 10,000 cases (which is probably a huge exaggeration), that is less than 10% of its population. Now lets assume that each of those hypothetical cases live in different households (unlikely, I know) my town has over 46,000 occupied households. It would mean that three quarters of them could get together, lick each other’s faces, and not pass on COVID (although I would advise against that! )
My concern is that the large number of people who don’t have the virus and so can’t and won’t pass it on become complacent. The 5 days ends, they all remain healthy and so continue to mix, even though the rules no longer allow it.