Franbern, I'm not criticising anyone who genuinely needs support for their health. Unfortunately, though 'support bubble' is being used as a lame excuse for socialising.
My neighbour is very active, fit and well, used to occasional visits from family. The recent daily visits are due to 'boredom', as her usual shopping, coffee and meals out are not happening. Her children are bored, too, with no after school activities etc.
There are far worse things than being bored.
However, I think tests and 'covid safe' arrangements tend to provide false optimism. 'I do not feel in any risk' worries me - as there is always a risk. The tests aren't very accurate, after all.
My friend (a nurse in a covid ward) is completely exhausted, losing hope, planning a career change - and horrified by the behaviour of the general public, who still don't really seem to understand the danger.