Must be nice to have perfect kids. All the five year olds I have known could be quite unpredictable when they got excited.
Not perfect. We just take the time to train them in basic safety and to respect certain hard fast rules because otherwise their naturally unpredictable behavior could lead to tragedy. It's not rocket surgery. But I know that many parents feel differently about such things and as I said, natural selection sometimes comes into play as a consequence of laissez faire parenting.
By the way, I don't blame the kid. The father is obviously a fool. At least his idiocy resulted in comedy rather than tragedy.