I'm in Atlanta right now. It's great!
My neighbors are from Chicago. They said it's like Atlanta, stay away from the **** areas
And be uber careful after dark, no matter where you are in any city. Walked up and down Michigan Ave in the late 90s and 2000 when I traveled for business. Nice museums, good stuff to see. But you just don't wander around after dark.
Haven't been to Underground Atlanta in 20 years either. Not sure I'd go after sunset anymore. Definitely not at 2am.
Just don't swim in known shark infested waters.
I'd still rather walk in the woods anytime day or night than a big city at night.