In all these comments and in stories and comments in the NYT and WSJ, no mention is made of the fact that the priincipal "buzzed" in the killer who was locked out because she recognized him as the son of a teacher. It is even possible the principal knew of the killers "odd" personality. Tragically, she died later, but can people never have the common sense of perhaps it is best not to mindlessly follow routine procedures as the principal did? Had she kept the killer outside the school, this tragedy might have been avoided. True, this is just supposing but that would have been the prudent thing to do.