I think we all read a little too much into this and it causes some people to lose trust in the schools and ask for things we dont need... Like security or teachers being armed which is quite silly in my view. I think we should enforce metal detectors in all schools and have the doors locked and entry allowed only by comms inside. Some schools in bad neighborhoods have these. Yet I believe all schools should, this might help prevent dumb things like this from happening.
Also If I was a parent whom lost my child like this.. I would sue the school board. It is in a way their fault for such a man to enter the premises. The very least they could do is compensate for the funeral, that should be a given.