Discuss the background and mental condition of the person referred to as "Roof."
Roof is not really an ignorant redneck or KKK white trash--his family seemed quite well-off when he was a child and according to reports he was bright in school.   He's clearly not normal--his OCD is likely from Asperger's or autism.  He got into drugs and someone like him, very obviously, should not have been permitted to carry a gun.