The biggest impediment to donating foodstuffs by grocery stores is most often governmental food safety regulations. A store just can’t take foods it needs to pull off the self and donate it. It can be onerous to get the special permission to do things like this. And yes, management is too lazy to jump through all the hoops and put out the effort to try as it often stands.

I highly recommend working with your local government to make it easier for a grocery store to donate foods.