Surely it is better you taking reasonable care, avoiding the crowded places, washing your hands and watching what you get for her over some stranger? If there is a lock down the supermarkets will close, if they don't what is the difference or what is worse between 10,000 people passing through a supermarket in an enclosed space or 40,000 football fans in the open air
The 40,000 are packed tightly in confined, albeit open air, space. The 10,000 can come and go and not get that close to just about 9,999 of the others who are in the market.
If people behaved responsibly, there might not be a need for these measures, but many do not. Additionally, the virus symptoms do not manifest right away, so a carrier might be out there believing they are well but are spreading it.
they were supposed to be clear to play after today.

