I'm honestly reading this thread and seeing people who make their own lives small. It sounds like you are all living in bunkers.
I find this sort of attitude absolutely bizarre. Of course people are still going out, going on holiday, spending time with friends, going to work and all the various other things most people get up to. It's just that some of us also like to keep enough items in stock that we could look after ourselves and our friends and neighbours for a few days if we needed to. As others have said, it's basic common sense really....a shame the government have to remind people!
It seems completely sensible to me. Just in my own circumstances I can think of plenty of times it's come in useful when we haven't been able to or wanted to go to the supermarket. When we've been ill, when I didn't want to queue outside Tesco during the pandemic, power cuts, severe weather etc. We already know there's going to be high food inflation this winter, compounded by the weather and bad year farmers have had so even from a budgeting point of view it makes sense to buy some extras of the food you usually eat to mitigate price rises a bit.
DH was made redundant a couple of years ago when I was on maternity leave and I was really glad we had quite a good stockpile of basics like pasta, rice and lentils and a freezer full of bread, fruit and veg as we could really cut back on our shopping bill for the time it took him to find a new job. Personally I don't feel worried at all and in fact it gives me some peace of mind.