I can't comfortably say that I do, particularly since there are a lot of things security-wise that could be done in schools - but I have other reasons in addition to that one that comes most immediately to mind.
As someone who has been "paying attention" to the "overall picture" of things that have gone on with, for example, America's children (I can't confidently offer a "reading" on children in other countries because I've lived in the U.S. all my life); I think (no, know) there are deeper, less-surface-level matters that need to be addressed with regard to things like school shootings. Of course, fixing those will take time; and in the meantime, there needs to be something done to protect everyone inside schools.
The subject is a Hub I've been incubating for a long time now. There are things adults - parents, educators, even therapists who specialize in trying to help children - need to understand better about children before yet more children become so damaged, lost, isolated and/or angry that they essentially become "time bombs". True a lot of today's misunderstood and lost kids don't become so extremely destructive that they go on shooting rampage; but even for all of those who don't, a whole lot of them become destructive to themselves, others and/or in relationships because far too few people understand "how children work", or more importantly how children feel.
So, while something certainly needs to be done to address the most immediate potential threats, if a lot things about young children don't become better and more widely understood in the near future we're going to have more and more kids so damaged, isolated, alone (whether they have loving, well-meaning, but clueless parents or not) and become increasingly angry. The disturbing thing is that many of the people who have taken us all down this road are those who mean well, are well educated, have "say" in children's lives, but have little or no common sense in general and/or little or no understanding of children - or apparently, memory of being a child themselves.