Really difficult decisions are having to be made. Keeping the vulnerable - elderly and younger but unwell - isolate for their own protection is surely sensible?
Children have 0/0.1% death rates from this virus. So if they get it, they will survive and be fine, as will a similar % of fit well under-65s. Awful if you're the 1/1000 of course but these are really hard decisions that someone needs to make a call on. Those over 80 have 15-20% death rate in all countries affected.
For those, as suggested by individuals implicated and understandably terrified, who might be medically vulnerable themselves and live with children or elderly, emergency provision will have to be made to help you and I'm sure that's something being considered.
But for the vast majority of our UK population, older people don't directly live with their families (unlike Italy...) and most kids live with fit under-65 year old parents. And they will get the virus and recover.
Then, in 4 months (or whenever) there will be fewer people in the population infected, so the spread to older and vulnerable people will be enormously less.
This is going to be huge and no-one knows (inc WHO) what the right strategy is. But a strategy suggested by scientists, virologists, epidemiologists etc is probably worth giving credence to.