The punishment for a crime depends on the crime. The crimes of driving without insurance or licence have nothing to do with the fact that the child died.
The crime that caused the child's death, according to the charge, was careless driving, not reckless driving (which is more serious) or dangerous driving (which is quite a bit more serious). Which crime he committed depends on what he did, not what happened as a result.
For example, if he had driven along the road, beside an otherwise law-abiding citizen who had driven exactly the same way, but had not hit anybody, they would both have committed exactly the same crime, and would be liable to receive exactly the same punishment.
Tantrum

is exactly what you're having here, I'm afraid.