With the game out of hand, I don't think it was a bad idea to go for the record. It's more coincidental than anything that N.O. started that final drive on the ATL 33. If the Falcons had moved further upfield and the Saints had taken over at mid-field or even in their own end, I think they still would have tried to achieve 30 yards worth of passing. Had that been the case, there wouldn't have been nearly so much fuss over going for the record. As fate would have it, though, trying to get 30 yards worth of passing when you start at the 33 yard line means there's probably a good chance it will result in a touchdown.
In the back of his mind, Coach Smith is probably not minding the decision, because now he can use that as motivation should the Falcons meet the Saints again in the playoffs.