I understand and appreciate the abundance of caution.
But still: this is a symptom of the present state of things–that we’d rather lock up an entire metropolitan school system because of one person, that we’d rather teach kindergarteners shelter-in-place songs to the tune of “Twinkle, Twinkle, Little Star,” rather than write (and enforce) some laws that keep certain guns out of everyone’s hands and keep all guns out of certain people’s hands.