I see the problem in budgets and budget sources.
As I stated in one of my posts, in Norway (I've heard rumors of it - didn't verify it myself) the municipality pays for assisting a family with help, while the state takes the full bill if a child is taken out from a family - hence the municipality (who is responsible for "barnevernet") has a clear financial motive for aggressively taking children out of families. However, the statistics says that the level of "aggressiveness" between different municipalities differs a lot. It could be explained by different municipalities being in different economical situations, but I believe the more likely reason is that it's very much up to the employees and management of the "service" how aggressive they should be on taking children out from the families.
It was pointed out that people who have been abused by their parents as a child are likely to apply for positions in Barnevernet and be overly suspicious against parents.