If somebody reports child neglect, but doesn't report any indications that would invite a reasonable suspicion of child neglect, the government shouldn't be spending any more time on it than on all the other people who don't have any evidence of neglect. They're fearful of doing this, because if there turns out to be abuse or neglect and they got a call, they'll be lynched for it.

They should just triage with consistent rules that respect the individual freedom of parents and their children, accept that sometimes this will cause them to miss something, but not accept that they made a mistake as long as they have a record that they stuck to the rules. If the rules are not good enough, update the rules.

Child protection agencies should do this regardless of the justice system's view of what has happened. Keep a fund for settlements, make guidelines good enough that you won't have to pay them out often, and immediately settle whenever something happens, without taking responsibility. It may not appeal to the sense of justice for an agency to pay when it's done nothing wrong, but child protection isn't a person, it's a function of government, and compensating people who have lost something important to them (like a child, sibling, or grandchild) is restorative.

edit: Blaming the busybody is similar to being content to punish SWATters. We need a system that can receive an anonymous report about an innocent person, and not show up and kill them. There will always be borderline attention-seekers and people who will call in false reports; we need a system that expects them. The system failure is the problem that we can improve on. The scapegoat is an excuse not to improve.