Six year old who shot teacher in Newport News Virginia update:

[haele]

31. Anywhere. Family members, Neighbors. Unsupervised Media.

If the kid is already overly aggressive or borderline psychopathic, s/he can easily remember violent or threatening scenes from an otherwise appropriate show for an older sibling, the evening news, or a jerk/jackass jump-scare type YouTube short s/he came across and act those scenes out when uncontrollably enraged.
We've experienced this in our family, an unusually aggressive child who had outbursts of anger and defiance even before she was a toddler. She also sneak/stole and hid items that caught her attention since she could walk. She never experienced discipline that was in anger or violence, and her parents were always careful to be attentive, calm and friendly around her and her siblings.

The only option is to seek professional help for such a child, because there's no evidence or idea where such rage, defiance, or aggression is coming from.

Sometimes, the problem really is something in the wiring of the kid.

Haele