he did good, not only did his gun not kill children, he made that school MUCH SAFER by being there in the first place. one might even say that a violent man was just about to enter that school with two pistols, and a semi-auto rifle intent on killing everyone inside to get his name in headlines, but upon seeing this man carrying a gun, decided that maybe others in there might have guns as well and that should he enter and start shooting, he would have a lethal dose of lead poisening before he could actually kill anyone, so he decided the prudant course of action would be to promptly go home and seek out medical help.