At what speed was he traveling? What is the posted speed limit? You know these things how? There's no mention about him blowing a light or a stop sign. There's nothing reported about him speeding. Until I see that, I'm convinced they ran out in front of him and left him no time to react except to down the bike or hit the kid.
Offer evidence to the contrary.
The evidence he was traveling at an unsafe speed for conditions is the injured four year old child.
You seem determined to forget this in your attempts to defend a government employee.