Yes - likewise the competence and ability of MPs is very variable - some good MPs, some dreadful.
It is true that there was an approx 40% increase in care proceedings being brought before the courts after the baby Peter details were made known in the public domain. The reason for this was because social workers became (unsurprisingly) very risk averse, and brough proceedings in families where there were concerns but were being monitored. Who could blame social workers (after the gutter press led by the SUN did their best to pour scorn on the entire child protection system) for becoming anxious about families on their caseload, and bringing care proceedings. FWIW I think this was probably a good thing, because in many cases I think children remain unprotected because of a reluctance on the part of social workers to curtail the "support mode" and realise that sufficent change is not being made in the abilities of the parents to ensure that children are kept safe. The rise in child deaths thay JH mentions rather underlines this point. If those children were known to SSD (and I think the majority of them were) if they had been removed, this would have prevented the tragedy occurring.
When JH talks about lack of "checks and balances" that he returns to again and again, this is his shorthand for his contention that applications for care orders go through on a "nod and a wink" and everyone involved in the conspiracy join forces and the judge "rubber stamps" the recommendations made by the professionals.
As far as JHs comments about "wrong judgements" being made, I believe that he includes in this, any case where children are removed and care proceedings are initiated, with which the parent disagrees. I have been involved in hundreds of cases of care proceedings and have never met yet a parent who is in agreement. I amnot of course surprised by this because if the parents were aware that the children were being significantly harmed they would be in a position with support to remedy matters, and sometimes of course this does happen.
I don't understand JHs figures about the "number of children protected" - what definition of "children being protected" is being used here. One of the problems is that he perceives there is a distinction between child protection and the numbers of the children adopted, which is of course one and the same thing.