The situation here is not letting two toddlers ineffectually flail at each other.
In the video, you hear at least one adult egging on at least one of the toddlers.
The very specific situation we are discussing is encouraging fighting. As such, at least one of the children is acting as a proxy for the adult.
If you tell your kid to bust mine in the chops [NOTE: not the words in the video, and hyperbolicized for emphasis], I'm going to be pissed at your kid, but I'm not going to bust HIM in the chops. Lord help you, if you're lucky you'll be in the hospital, and not have to deal with my wife, who will justly consider you the acting party.