They shouldn't report to police because they shouldn't be involved in the lives or decisions of others. The whole problem is the elders unnecessary involvement in other people's lives In the first place.
They're shouldn't be any disfellowshipping or shunning or need for a jc. Let people live their lives the best they can and if they decide not to be a member of you're faith shake hands and part ways.
If a person is wronged let that person or their guardians decide how to react. By following this advice there would be no more lawsuits or investigations. But it's possible you lose membership. Which is where all their conundrums stem from.