I would say that the reason this has been considered to be in the public interest is because allowing it to pass could result in a loss of public order.
Think about the number of people attending foodbanks and the rise in shoplifting under austerity measures. Then think about the riots of a couple of years ago and how people who are normally law abiding will loot when they think there won't be consequences. Now think about the insane amount of food being thrown away
It's not a stretch to see how you might end up with mass disturbance at premises where food is routinely disposed of once it becomes public knowledge that there will be no consequences.