It was interesting to read about the differences between Scotland and England and Wales and I imagine there are lessons to be learned there. But I think you have misunderstood some of the issues, notwithstanding.
You quoted what I wrote about neglect and said it was "disingenuous" to blame parents, but - NB - I was commenting on children in care, not parents, and I was posting about what could be done better by the state, effectively - in relation to crime, education, care - a whole host of things. The vast majority of children in care suffer considerable neglect while in care and are seen as easy prey. I wasn't talking about parenting at that particular point.
But since you raise parenting, in relation to the points you made about the parents, the conference you attended was quoting from summing up remarks made by the judge in the Oxford grooming case - I have read the summing up and recognise the comments - but - NB - the judge's comments here was in the context of saying was that some of the children had not had any problems prior to their involvement with the gangs, and the judge emphasised the fact that they were from normal families and that the gangs had absolutely destroyed their futures, in dispicable ways. So, a different context from that which you raise. The judge didn't draw the conclusions which you have drawn/the conference drew.
Basically you have a spectrum - families where there is emotional neglect and no connection with the children (on the left), families where the parents are busy and their approach to parenting is "hands off" (this is very popular on MN or has been in the past) or where there are fractured relationships due to intergenerations trauma but the family otherwise functions as a normal decent family (in the middle) and families who talk a lot every day, give blow by blows of what they have done and their thoughts and feelings, having strong healthy emotional connections with eachother, know eachother well, are well informed about relationships generally including the dangers of predators (as part of their awareness of what is and is not healthy) and who warn their children in child appropriate and effective ways (the right).
Children and adults from the left and centre backgrounds are more likely to experience unhealthy relationships in future and more likely to be groomed. Those from the right hand side (NB this is not about political right and left!) are not likely to be groomed, and so I think this nuance was lost in what the conference was saying. In relation to the right hand side of the spectrum it is still possible for there to be attempts at grooming or bad influences some of which might initially cause problems, but the situation is far more likely to be recognised and dealt with (ie stopped by the family) if the family is close and engaged and well informed as per the right side of the spectrum.
Just like young children who are taught the pants rule in appropriate ways are less likely to be sexually abused than young children without that guidance.
We can teach children about healthy relationships to bring more children to the that right hand side of the spectrum and we could teach parents how to parent in that way.
The above is explaining things in a very basic way - trying to illustrate things so that it is clear. If properly organised and thought through, many changes could be effected to positive ends.
My perception of abusive relationships written about on MN is different from yours - I see a lot of experienced and wellinformed posters helping other posters to get out of situations which, without that advice, they might have stuck in. You are right that intelligent adults can be fooled by sociopaths into abuse relationships where they experience harm and gaslighting etc - but ime it is those who have not had healthy relationships modelled - ie those from the middle or left in my example above. And reading about how it works on MN will help people get out of their situations and focus more on healthy relationships. And again, the right level of education about emotional intelligence at school age is going to make a big difference here.
As an aside, what you said about the conference illustrates (imo) one of the problems we have in relation to social care - inadequate training, lack of knowledge of relevant research or relevant factors, too frequently a lack of joined up thinking.
At the end of your post you talk about parents not being able to restrain a 13 year old. I think you are missing the point here. In families on the right hand side of the spectrum there is no way a 13 year old is going to be let out if the parents suspect something is going on, whether drugs or trafficking or other. They won't need to restrain the child because the relationship is strong enough for them to talk to the child and tell the child that under no circumstances will they be going out, and then to sit down and help the child talk.
I am in no way judging parents from the middle or the left as I strongly believe that most parents do the best they can with the resources they have available to them - and that public services could be doing a lot more to support.
I don't think it was appropriate for you to refer to my earlier post one of your earlier posts as a "long rant" by the way.