This is about grocery shopping and the need for unselfishness and restraint due to the difficulty of balancing 'supply and demand'.
I agree that it shouldn't become a political boxing ring, which is both tedious and unpleasant.
On a more relevant note, I remember as a young girl the ubiquitous brown Ration Books just after WW2. One could only buy items for which one had the necessary sections of the book, which the shopkeeper tore out each time. I wonder if this system would work nowadays to stop selfish panicky people filling several trolleys at the crack of dawn with half the supermarket?
I expect nowadays it could all be done electronically in some way. But it shouldn't be up to the poor checkout staff to police proceedings.