Because Atlanta is not a world class city - see 1996 Olympics
Because Atlanta rolls up the sidewalks at night, it's barely a 12 hour city never mind 24
Because Atlanta has no real central business district - Buckhead financial area is a possible exception but clearly isn't downtown
Because Atlanta is epically mismanaged and a text book example of what doesn't work and how not to run a city
Because MARTA has zero appeal to 96% of the people, pick any one of 100 reasons
Because what's the point of expanding MARTA when you have about 1 BILLION in estimated sewer and other infrastructure reapirs looming
Because Because Because.....