While I agree with self isolating when you have symptoms of Covid19. I think it is not so cut and dry.
I would like the mention that new studies are showing that people shed large amounts of the virus before symptoms worsen.
15 % of people do not have a fever, some people don't have the cough. Some people start with diarrhoea 10 % then go on to have the fever up to four days later ( facts from case studies ) expressed by Dr Dominic Pimenta and Dr John Campbell.
So there are those that will just have a gippy tummy wondering around and people who may just have a headache and fatigue. Normal every day symptoms. Not to mention that asymptomatic people are potential source.
After seven days of self isolating with mild symptoms they go out. Viral shedding falls after ten days so it would be even safer after fourteen days. Also people continue to remain contagious even after they feel better.
What about people single mothers and poorer people who can't get a shopping delivery ? They have a minimum spend and bookings are filling up. What should they do if they need to eat and are waiting for benefits to be paid ?
Also some people cannot afford not to work. Debts need to be paid, bills rent, mortgage. My list is endless of outgoing money I can't be the only one. Self employed people who contract are vulnerable no sick pay, no back up nothing.
I have vulnerable people in my life and would abide by the rules to protect them and other people in society. I just think it's not that easy and hard to enforce.