"Using words like chilling and disturbing in this situation is clearly meant to portray the child as some sort of psychopath which is both ridiculous and insulting to her and her family."
Quite Gold.
Last year DH had a stroke. He was sent home with the instructions to be stress free for the next month, as he was at very high risk of having another (stress free, in our house? Ha!)
We had to farm the dc out for most of that month. Ds1 had so many episodes which a family member witnessed and described as terrifying to see, and chilling, and described ds1 as a little shit, we were all at a loss as to what was going on.
We pointed out to him that he couldn't behave like this, Dh could end up extremely poorly because of this, and he sat there smirking saying he didn't care.
Only he did care, he was so terrified that he couldn't cope.
My mother had a stroke scare a few months ago. Ds behaved in exactly the same way, but luckily for DM, not in her house in front of her.
He is so predictable with this "emotionless" "chilling" behaviour now. He is not a psychopath, but a scared boy who cannot put his feelings into words.
I have had many times, under name changes, when I've asked on MN things I should have dealt with in RL, mainly because on MN, you can get a mix of replies, including helpful ones from parents who've been there and done it. In RL, all my advice tends to go down the route of force him/smack him/really tell him off (I mean properly, because you're obviously not doing it right) etc, and it is very unhelpful, and has always come from people who have children who don't have these issues at all.
It's not disturbing at all, everyone reacts in different ways when they are under pressure.