I've certainly seen that almost all of them are perfectly nice one on one, but once they get into a group setting they can be utterly horrible (I've been called a cunt by a seven year old girl for telling them they need to let someone else have a go on the xbox). Society has a lot to answer for, in telling people that they should be the centre of attention at all times, and have everything that they want whatever it takes.
Its a really difficult problem to solve, and if I'm brutally honest, I think a large part of the generation growing up now was lost years ago. Our organisation exist to work with seven to twelve year olds who are particularly bad, and even at that age there are a few who I have little doubt will spend their late teens and early twenties in prison. That largely comes from growing up in a culture where nobody has achieved anything for generations - and so they've been told from an early age that they won't either, given that sort of background the odds of working hard to make it are pretty slim.
May I ask which organisation it is you do this work through, and how you got involved? If you'd rather not say then don't worry.
The particular organisation I'm working with is the Forest Estate Community Hub, in Egham, which is run by my church. I ended up getting involved mostly because I was one of a few people who thought something like the kids club we run was needed, and in a small church the only way things like that happen is if you step up and get on with it!
The closest we get to a web page is a Twitter account at https://twitter.com/ForestEstateHub, which gets updated both with the kids club, and various other groups that use the building.
There's plenty of evidence that the effects of parenting are generally smaller than we would like them to be, again with a few exceptions.
However even with those examples excluded, the amount of talking that a child is exposed to when in their developing years has significant impact on their long term development; see the "word gap" [1]. Not only that but nutritional environment (often based on parental choice) for the first 2-6 years has a massive impact on long term brain development [2].
So yes in fact parenting practices have a massive impact even when you exclude abuse and neglect.
[1] http://www.npr.org/2013/12/29/257922222/closing-the-word-gap...
[2] http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2018962/pdf/arch...
In fact, I vaguely recall that on the issue of parenting he argued that genetics play a big role, but that so does parenting.
Basically, he's arguing that we factor in genetics more, not that we disregard parenting and social environment as a significant factor.
(but be sure to let me know if I'm wrong. It's been quite a while since I read The Blank Slate)
I've long been of the opinion that poor parenting (and/or an abdication of responsibility on the part of the parents) is a major contributing factor to teenage delinquency.
What are your thoughts, based on your experience of working with these kids?