It's nice you don't know anyone who wouldn't immediately jump to the aid of a lost/hurt child. I know a lot of them. Several who work in education.
Me, I'd help a lost child from a distance, and probably phone the police while waiting where I was. I'd never dare move 'em from the spot. And I certainly would never want to be alone with one.
As for putting a plaster on one, or giving it a hug to say "there there, it's ok".. Not a chance.
CRB checks are NOT a good way of deciding if someone's suitable or not. You never get to know the circumstances of a case.
Example: Chap I know who's a friend of the family met up with a pretty lass at a night club. They ended up dating, and met up at the pub regularly. She went round his place and dropped in as you do..
Until the Police turned up on his doorstep and arrested him for statutory rape. Turned out the lass was 15, despite claiming around everyone that she was 18.
It went to court, and he's now on the sex offenders register (the lass says her parents shopped him when they found out the two of them were dating, and she was absolutely distraught).
Now, this chap is great with kids. Not the brightest spanner in the toolbox, but well meaning, caring and he clicks with kids..
CRB says no chance. This is the problem with data like that, it turns everything into black and white when things are so many shades of grey.
Honestly, it's one thing to turn around and say "you're all afraid of nothing, it's just a media storm", but the problem is people ARE afraid. The storm didn't start with the media, it started with legislation that hauled people over the coals for doing what adults do, and having someone being overprotective, and getting perfectly normal people strung out to dry. Happens all the time.
The thing with fear is that founded or not, it is always very real to the person experiencing it. The whole of western society these days is founded on the "point a finger at somebody else, it's all their problem, search for a way to be offended and you may make a boat load of cash" attitude. Or a "I can accuse you of this and your life will be ruined" attitude if someone doesn't get their own way. Very valid worries to carry with you, as I've seen them used on people I know before. And even when acquitted, I've seen lives wrecked in the process of proving innocence. And when you're proved innocent, it doesn't take back all the hardship, stress and ruin of a life.
The easiest way to rule is to have people afraid (which is why the old Soviet way was so effective). As long as you can scare people on the small things (is my neighbour out to get me?) they won't take you to task on the big things (why are you ruining my country?). NuLab seems to have this down to pat. Make everyone afraid of everything, say it's all for the good of the children and smile benevolently, while doing whatever the hell they feel like.