Nearly 1 in 4 TSA agents are ex-military.
http://www.tsa.gov/who_we_are/workforce/index.shtm
There are a few bad apples - just as there are in any large group.
The main issues with TSA are not the fault of the agents. It’s the system. It’s the leadership. Most of whom have never spent 15 minutes working on the floor of an airport.
Your overall profile doesn’t fit ATLANTA airport. Mostly minorities (blacks) and a few token whites and immigrants, all with not two cents worth a brains to rub between them.