Because they have no power over the agency they work for. And neither will you, when you get there. Keeping this righteous attitude will kill you working in that system.

Yes, a worker has to track down the family and evaluate the situation. Yes that yakes time. Yes everyone deserves to have working gours and non qorking hours. Would you personally like to pay the taxes for 24/7 child welfare coverage? What are we supposed to do, take away a child with no evidence and no investigation just because an intern says so? For how long? Where do we put them? Who says when they can go back? When does the judge have an opening to review the statement? Can we take anyone's children? What if the kid is just mad and knows the system well enough to know that all they have to say is "I don't feel safe" and their parent will be punished? Maybe you could be the one to pick them up from school and bring them home without notice? Always have an empty room? Easy enough.