As someone who has worked in Children's Social Care in the UK (not as a Social Worker), and without commenting on this specific case due to a lack of information, I have to say that Social Workers get an awful reputation. I think this is because their job involves children at risk, which tends to get people emotional.
Social Workers are inundated with cases all year round, constantly have to deal with the worst people in the country, and if they make any mistakes they get pounced on immediately. The percentage of cases that go absolutely fine is well over 99%, but whenever something unusual happens the newspaper headlines all read "Social Workers Incompetent" rather than "Social Care Massively Underfunded and Overworked".
They get vilified for not taking kids into care, they get vilified for taking kids into care, they get vilified just for fucking talking to parents and trying to set up support.
"Don't talk to Social Services, or they'll take your kids away" seems to be the common feeling, despite care proceedings being used only as a last resort or in an absolute emergency. This means families don't work with Social Workers, don't accept support, don't even accept that maybe being drunk 24 hours a day or letting your new partner's brother's friend pick up your kids from school isn't appropriate.
On top of all this, Social Services literally can't do anything without police intervention or a court order. A judge has to agree to any care order, any adoption order, or any legal proceedings against a family, and the police can only put children into our care without a care order for a maximum of three days.
We actually dealt with a case once were we tried to get some kids back to Italy. The mother had given birth (to twins) while in the UK, and when she tried to go home, the children didn't have passports. But the mother wasn't allowed to stay because her visa ran out, so the kids ended up in our care but placed with a relative. And because the mum had been foricbly removed from the country, she wasn't allowed back in. It was a nightmare to deal with, and I never found out how it eventually got resolved after the case transferred to a long term team. For all I know, the kids are still here, and ended up learning English.
I don't know why anyone would want to be a Social Worker, and anyone that sticks with it for more than a couple of years gets my utmost respect.