I don't know all of the details of the conversations yet. I think that will be debated for some time among the various protagonists as to what actually went on in advance. I do know that for many situations we do in fact provide.... When I worked in local public health, for example, if there was a situation in school, there would be a notice, a note that would actually go home to parents to explain what was going on, what they needed to do, etc. Those are all some very practical kinds of things.
Normally, most people comply quite straightforwardly with whatever direction is being given. Most people are sufficiently concerned to do so.
Again, we don't know all the details of this case, what actually went on at this point, but each of these events becomes another opportunity to question whether enough was done, and if not, what needed to be done or will need to be done next time.