Please know that some of us see this situation for what it was, a gravely evil act.
Not sure what you mean here. "Evil" implies a simplicity that I doubt exists in this situation. I suspect that there was a complex combination of factors driving the shooter, including mental illness, guns at his fingertips, stress, and a lot of things that we may never know about, unless someone finds a suicide note or a diary or some kind of record kept by this guy.
IMO, the best way to reduce these kinds of incidents is to understand them thoroughly. You can't address the causes of something if you don't know precisely what they are. There are probably factors in common, and I will hypothesize that effective treatment of mental illness and sensible gun and ammunition control will help.
For a thorough examination of one school shooting, I recommend
Columbine by Dave Cullen.
