Never underestimate the psychological attack multiplier of doing someone harm and then attributing it to someone else, or them, or no one at all, or rationalizing away that if you hadn't, someone else would have. “You're just not adapting to the environment [by not giving in].” “Oh well, that's life.” “It wouldn't have happened if you'd just kept your mouth shut.” “Now look what you made me do to you.”

That said, disallowing “you seem to be overreacting” entirely allows the opposite bogosity where any critical opinion can be immediately silenced, in the general case (albeit that's not necessarily applicable in this case).

These are partly tied to the fragility of agency in the inherently-coercive physical world in general.

There's another element where many-to-one non-peer-visibility communication channels create a non-self-regulating funnel with nonlinear effects: a million sources can independently decide that their individual piece of hate mail is small enough that the target should be able to handle it. Certainly peer visibility is at least very incomplete over channels like Twitter.