
The worst abusers are those who're given the children removed from homes, often on the back of hearsay evidence. Let me put it this way, a single parent trying to bring up 3 kids is forced to work nights to make rent or mortgage payments, buy food, pay the bills.
Probably qualifies for daycare assistance of some kind, but was denied by some moralistic arsehole who doesn't believe in sex outside of marriage (yes - seen it happen) or can't find a daycare that will accept government assistance (because local governments are notoriously slow in paying their bills).
So being forced to leave her kids at home or in the car by themselves gets reported and end up losing them. The kids then end up with abusive foster parents (happens a lot) and that is the worst you can do to a child.
You've ripped them away from their family, and into the home of an abuser that in their eyes has all the authority to do as they please. Obviously they've done something bad in order to be taken and the abusers are punishing them - or at least that's what they end up being conditioned to believe.
Seen it, been disgusted by it and there's absolutely nothing that gets done about it. There's no accountability and the kids end up getting shunted around from family to family. Forget an education, forget a stable upbringing, if child protection officers actually understood that taking a child from a family ought to be the action of last resort perhaps it wouldn't be so bad.
They ignore laws about giving the children choices (like living with friends or relatives), and not a single person receives even a reprimand for failing to check up on foster parents or those that adopt.
Oh I'm sure the job is as nasty as it gets, and I'm sure there are not a few that do give a shit. Unfortunately they don't seem to have a clue how to do their jobs.