Well... "Were they only food shopping for while they were "attending" their seasonal property?"... this is part of the problem.
When we came home from Florida we didn't go shopping for 14 days because we cared about those we would be exposing to whatever we may have picked up in our travels through the entire East Coast. Food shopping is not quarantining, no matter how you look at it. Our friends stepped up and delivered things we needed to our home. IMHO these folks should have made arrangements to have supplies delivered or simply stayed put instead of putting others at risk.
Dave