Look, what the guy did is incredibly wrong and I haven't researched this at all but WTF is a 3 year old doing on the street?
He was playing with his siblings, probably on his front lawn and just ran onto the street suddenly. At a 135km/h there wouldn't have been much time between "there's a car" and "there's a car and my brother is heading towards the road". Which is why the speed limit is 50km/h.