The problem is we're all working with uncertainty, trying to put scraps of information together - often not being certain how valid they are.
Let's say you buy a block of cheese, what if the packer in the creamery had CV-19? He would have been masked and gloved (that's standard practice before CV-19) but what if he has virus on the outside of his gloves because he touched his sweaty forehead? Same for a pack of bacon or a lettuce grown in Spain.
You could go mad with this.
I figure if it was that infectious we'd all be ill by now. Of course you want to control / minimise the risk but it cannot be eliminated totally. I think social distancing and hand washing is a reasonable response to reduce the risk for most of us. Some people are at very high risk if they catch it and they may be best to take further precautions.
People are generally very bad at judging risk - we tremble in fear of flying not realising the real risk is in the drive to the airport.
Personally I don't think it worth washing your shopping - but washing your hands after putting it away is worth it. Am I right? I don't know but I put my faith in those who do like the chief scientific officer and SAGE - although my pal reckons oregano is better to save us from the plague