Family law has changed a lot in the last decades and I think that most of the changes made have caused problems rather than alleviated them.
Consider the evidence in a recent case that resulted in parents in Canada getting reported. It reads as though it should be fiction - although it was reported in Canada's major newspapers - but this was enough to get a government investigation conducted:
"The teacher looked at me and said: 'We have to tell you something. We have to tell you that Victoria's EA [educational assistant] went to see a psychic and the psychic asked her if she works with a little girl with the initial V. When the EA said yes, the psychic said, 'Well, you need to know that this girl is being sexually abused by a man between the ages of 23 and 26.'"
I suppose that I have to admit that it certain cases some good may result from such investigations, but for the most part I think that they're harmful.
If there is abuse it might not get detected, probably resulting in it being driven further underground and possibly intensifying .
In addition, given the minimal evidence required to have an investigation launched, I suspect that the vast majority of cases in fact involve no abuse. At minimum it means time and stress for the family involved, and who knows what long-term psychological damage it causes.
Protect complainant's anonymity - as most places seem to permit - and it seems a relatively easy way for people to make life hell for anyone who annoys them.