I worked for a local newspaper taking those pictures of the kids that get printed with their full names. Having the full names is a way of ensuring you had the parents verbal permission to use the pic. Images taken out in a public space that are deemed 'newsworthy', don't need any consent but with kids it was more of a courtesy thing, and in case the kid was under a protection order and really, really shouldn't be identified.
Apols for hand wringy and any offence caused, but really, those NSCCP child protection guidelines linked to by the OP, they are a bit hysterical and fear mongering. If everyone took them seriously and followed them down to the line there would be no pictures of anyone under the age of 18 out there, ever. No pictures on Facebook, no pictures of kids used in advertising, shit, don't even leave the house because there might be some sweaty weirdo in the bushes with a long lens trained on your kid.
I have photographed countless child-centric public events for press and PR. I never submit any pictures without having spoken to the parents. I don't do this because its legally required, but because it puts everyone's minds at ease and its the polite, respectful way to do things. However, this doesn't stop the odd few anxiety-bomb parents coming up to me and having a right go about being in a public space around kids with my big scary camera. I just smile and explain why I'm there and promise to not take any pictures of their potato-shaped sproglets.
But really, the risk involved in having a picture of your kid goofing around in the park, out there on the web, being picked up by a weirdo and manipulated into something awful, is pretty minimal. There is a risk of a car mounting the pavement and running into you when you are innocently walking to school, but that doesn't stop people walking to school, along potentially risky pavements. And this is just my opinion here, but if a child is at risk of grooming, aren't there a host of other factors involved with a child's vulnerability to this behaviour?
Of course parents are right to be mindful and aware of their child's digital footprint, however I just feel that perspective can easily be lost around this issue, mainly due to a fear mongering, paedo-obsessed trash media along with some peculiarly anxious and slightly prudish elements of Anglo-American parenting attitudes.