Why is it that any time the subject of private voluntary human interaction comes up, so many people immediately think of the risk of mass death, horror, and se

Why is it that any time the subject of private voluntary human interaction comes up, so many people immediately think of the risk of mass death, horror, and self-destruction? What a dismal state of mind. I look on the bright side, because I know that human life depends on private voluntary human interaction, and is ultimately impossible without it.