I mean, this is also just kind of how mandatory reporting works.

If you tell a teacher, a therapist or a priest that you are going to kill somebody, in many states they do actually have to report that and can be held liable for the resulting crime if they do not.

Every time we have a mass shooting in the US it inevitably comes up that they wrote it down or told somebody and then the next logical question becomes “how could we have stopped a mass casualty event?”