Except it’s a finale for real people.
As I write this, we don’t know if the latest is a random shooting or a disgruntled employee shooting, and, after all, one must keep track.
And it isn’t etiquette to shoot any one you’ve been introduced to, even if you are disgruntled, and so, as Alice says, it’s better not to be introduced to people or we shall have no mass murders at all.
Though I suppose some sort of limitations on weaponry might also … never mind, I was joking: This is America and it’s perfectly fine to shoot people you’ve been introduced to. We do it every day!