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Yeah I think all of the people who would usually have lunch at work are now cooking for themselves also. Shutting all non-essential shops means that EVERYONE is going to supermarkets, even if they need something like wrapping paper / bike lights (just two examples from our household in the last few weeks).
Every time I go to the supermarket / for a walk and find myself thinking "why is it so busy, they should be at home", I have to remind myself that I am being hypocritical. No doubt some people are not staying home as much as possible, but any city with a high population density will inevitably have busy supermarkets etc.
I don't doubt that there were a lot of people walking, but I guess you were also one of the people walking, albeit for a good reason. It's the old 'why am I stuck in all this traffic' problem.