It´s just "natural" development. West adopted virtually same methods used once in the communist east. There is this grand idea of enlightened socialist state, that owns you from cradle to grave. It started all started (like always) with good intentions, to limit poverty and protect the weakest, before interested activists from Frankfurt school and bureaus became force above law - this is especially true in northern Europe. Court of law cannot interfere with decisions of local "child protection" bureau, once they got their eyes on you, there is no legal force, that will protect you.

EDIT: You have no fucking idea, how profitable child bussiness in Europe can be. You can get middle class income (state subsidies), if you adopt these stolen children. Bureau in return gets more money from state, the more children they "protect" from their families. All for the "greater good".