Im not sure if im reading the case right Was this Cop in pursuit of a Crime or just driving?
If he was in pursuit it sounds like he made the mistake of not turning on his lights and was involved in a accident. Unforntantely a child was killed by his failure but I wouldnt lynch the guy over it. It sad and hopefully this will be a wake up call to others to make sure your lights/siren are on.
If its the other case where he was just driving and struck a kid he should be held accountable to the same set of standards that any citizen would be and most likely sent to jail/lose his license.