That was part of the problem. The forecast didn't call for 2 inches, it predicted that the ice/snow would miss Atlanta, though not by much.
That is partly right. On Monday, that was what the weather advisory predicted. However, at 3:39 AM Tuesday, my wife, who works at a DeKalb County school, received a weather alert that said the advisory had been upgraded to a warning. The warning stated that there would be dangerous winter storm conditions, and that only emergency vehicles should be on the road. Everyone in state, city, and county government, and school systems, knew what was coming.
Why were the schools not closed? Several years ago, I forget which year it was, there was a weather forecast for a few inches of snow. The schools closed. Not a flake fell. The school systems were heavily criticized for pre-emptively closing. After that, they have been reluctant to close until they see the snow. This time, that proved to be a mistake.
Hindsight, as the cliche says, is always 20/20. Here in the ATL, even when foresight is 20/20, making the right call is, at best, 50/50.