And so it is entirely predictable that on digital-posting platforms, including the single-dimension email platform, people say things they just would not say if they had to witness or hear the effects on the recipient of their words as they deliver them.
Of course, we say horrible things to each other in person. But there is an instant feedback loop that tells us to stop. If we defy it, we witness the painful result instantly. We know we are doing damage. And that picture of pain usually pulls us back, and eventually stops us. We see the human being we are assaulting. We see the blood we are spilling. And that does something to us.