'As pointed out elsewhere, many US cities have done similarly, annexing adjacent towns and even entire counties (like done or all of Louisville, Columbus, San Antonio, and Indianapolis have), and become healthier for it.'
u forgot the other side of this point, ie, the complete opposite.
people just don't like crime, particularly when they feel their government isn't doing a darn thing to fix the problem. imagine that.
'Atlanta is now partly surrounded by breakaway cities, from South Fulton on its southwestern edge, Sandy Springs to the north and Brookhaven just east of Buckhead.'
'Arguments for creating an independent Buckhead have leaned heavily on what some say is uncontrolled crime throughout Atlanta.'
City of Buckhead: Data shows what proposed Buckhead City would look like (ajc.com)
and not an uncommon trend nowadays. i very much like Atlanta the way it is, but i don't count, cuz i don't actually live there.