Why do social workers keep failing children like Arthur Labinjo-Hughes?

Why does the number of children dead from abuse — like poor Arthur Labinjo-Hughes and Star Hobson — stay roughly the same year in, year out?

More children are taken into care every year in this country. So why doesn’t this reduce the number of desperate, abused children who are dying at the hands of the people who should be caring for them?

My suspicion is that it’s become normal for over-worked, badly-managed social workers simply to focus on the easier cases, and leave the violent addicts and the psychopathic step-parents alone. And if this is true, what it means is not only are children like Baby P and Victoria Climbié left abandoned, but that some children who might perhaps safely be left with their parents or with extended family, given enough support, are instead being taken and put into care, or given up for adoption, behind the closed doors of the family courts.