Unfortunately, people in positions of authority have no incentive to apply wisdom and common sense. Imagine if they ignore this report, and something bad happen

Unfortunately, people in positions of authority have no incentive to apply wisdom and common sense. Imagine if they ignore this report, and something bad happened to the child? They'd be crucified. It's far easier to take the report, do the minimal amount of investigation required by policy, and then let a prosecutor apply their discretion as to whether charges are pressed. The same perverse incentives apply to the prosecutor as well. It's no skin off his back to charge the mother, and he can always say "it's for the children!" if queried about it. But should a child die, when both the police and prosecutor could have done something, is something our society won't allow.