No-fault accidents happen. Accidents can have causes that are not legal nor moral blame.
There are always systemic factors that can be improved, for example working on street design to separate dangerous cars from children, or transportation policy by shifting transportation to buses, bikes, and walking where the consequences of mistakes are significantly reduced.
Cars are the #2 killer of children in the US, and it’s largely because of attitudes like this that ignore the extreme harm that is caused by preventable “accidents”