How the fuck were they supposed to prepare? Purchase more snow management equipment on short notice? Maintain a large fleet of trucks for the rare occasions that stuff like this happens?
I do wonder if they could have rented some snow/ice gear from areas not expecting snow for a few days but which had the equipment and supplies on hand. Wouldn't even have had to be government-owned equipment, there's plenty of companies around that keep plows and salters/sanders ready for snow, who contract out to remove snow and ice from driveways and parking lots, private roads and similar. Yes, it would have cost quite a bit -- fuel for the trip from the snowbelt to Atlanta and back, hotels, logistics to make sure salt and sand made it down, time and materials for the vehicles, but if it's only once every 3-5 years, it should be doable with a few calls and cash in hand.