More correct would be, a guy goes from school to school, finding him some outsiders, supply them with weapons and encourage them to go on a homocidal rampage, so that he can take over the school indirectly, or directly later in justifying his intervention.
He did that in countless schools before, Guatemala Elementary, Honduras Middle School, El Salvador School for Higher Learning, Venezuela University, Ecuador School of Economics, Bolivia Elementary, Lybia Technical University, Vietnam People University, Iraq Modern School and so on, and so on.
While the homicidal maniac with the gun must be stopped, it should be clear who the real bad guy behind all the school killings is and who also must be stopped to prevent future schools from being victimized. Not to mention that he should be put to trial.
This is a very thin analogy, and this must be someone who really likes schools :)
If we could stop using analogies and just explain it how it is, that'd be great.
Analogies help bring it down; they are the graphs of unumeric information.