The concern on communal feeding is to do with communicable diseases between deer. Chronic Wasting Disease is coming this way, and you can thank the people who bring deer from the midwest here to breed them for "superior" genetics. From what I understand, there is no screening for deer brought it to the state as the only way to confirm diagnosis is a post mortem histopathologal examination of a portion of the brain known as the obex. Clinical signs of the disease are often vague due to variation in incubation and shedding.