The only answer to this issue is for school districts to take on the crippling cost of turning their schools into high security facilities. Banning guns will only leave guns in the hands of outlaws and leave law-abiding citizens defenseless, which will never happen. Mental illness studies do no good because some of the perpetrators have no history of mental issues, other than hindsight from people who know them and are interviewed after a bunch of people die. No simple answers here, but big, obvious deterrents could be the solution... An example would be highly skilled security officers patrolling the hallways of our schools, ready to blow the head off anybody who comes in there with a gun, combined with metal detectors at every entrance. Man, I'm glad I don't have kids. My thoughts and prayers go out to all who do, especially the parents that have lost a child to this senselessness.