Lime, I'm certainly not someone who minimises the danger from predatory adults. I "see a paedophile around every corner" because there is a paedophile around every corner - statistically anyway, and they are just the ones with convictions.
It's in part because of that I think this is utterly ridiculous, because like other grand gestures with grand names (Every Child Matters; STOP and so on) it is on the surface in existence to protect children and as such there's a certain amount of disquiet when questioning it - as though to do so implies your desire is to do the opposite.
Ultimately this law, or motion, or whatever it is, is completely meaningless and as such pointless. A teacher may or may not have poor judgement but the only poor judgement that matters is poor judgement in a classroom. If this is an issue it needs to be dealt with appropriately but the one simply doesn't marry with the other. Numerous teachers have mental health problems which, it could be argued, may impede their judgement but to do so would break the law as well as be pointless. There are very few cases, if any, in a classroom, where poor judgement of the sort that would lead a child to a violent or sexual offender would come to light.
Furthermore, and most dangerously, this sort of attempt at safeguarding does anything but. By giving people a false impression that they are safe: that even individuals who are two, three, four steps removed from them are effectively banished, then a certain amount of complacency steps in. How many times have people who have expressed a worry about naked pictures of a toddler on social media on here been sneered and jeered at on here, for example? Even now I don't think people realise just how far-ranging sex offenders are. I knew a man fairly well some ten years ago - a social worker who changed careers to be a primary school teacher and then a headteacher. The school was outstanding, including safeguarding - OFSTED couldn't praise it highly enough - and then he committed suicide Christmas 2013 after indecent images of children were found on his laptop.
Yet every time a headteacher or teacher or social worker or policeman is charged you can hear the sharp intakes of breath and the gasps and shock. You will not ever stop a child potentially being exposed to a sex offender. Which is why, like traffic, we teach our children what to do and how to behave.
I honestly don't know how many times it can be said that denying any sex offender or violent criminal (smirking at DH now!) access to a child still won't keep them safe because those are the ones who are caught.