There's a parliamentary thingummy going on at the moment about cahms. It's acknowledged now at the highest level that services for children in the UK leave something to be desired.
There are very serious delays in accessing and getting genuinely effective, sometimes long term help and support for families, even when they are in crisis and screaming for help with their kids. Not every child is born perfect, some have quite serious hidden neurological deficits, disorders, or personality defects right from the off, others can develop them as a result of neglect or trauma. In both cases this country falls short on support.
We are good at sending parents on generic one size fits all parenting courses, but specialist training for professionals and parents is incredibly hard to source when it comes to more advanced requirements. It's no good telling the parent of a child with a personality disorder that there is one course every two years on the other side of the UK, when the next one is scheduled to run in 18 months time, and they have already had to hide all the sharp objects in the house!
If we could say that yes, every parent, (or school!) who asks for help with behavioral challenges in their children was getting that help in a prompt and timely manner - then we could jump to criticise every single time. However a quick glance through the teens section of this site (mostly "naice" parents) shows how difficult it can be to access help, even for the most educated and "pushy" of parents sometimes. Psychopathy to name just one condition is NOT dependent on socio-economic class - parents with fewer resources are unable to access the private sector though if it impacts their family.
Teen control is not easy, even with grammar school types, and the influences even those children from good homes are exposed to, can be shocking nowadays to those of us raised in gentler, times and places. We need to stop with the easy finger pointing and get down to the hard graft in helping these kids as a society.
We know that violence and sexual offences are on the rise in ever younger kids each year, yet we are in the process of cutting the specialised units, school places and services that can actually tackle these issues before a tragedy occurs. The area in question is one with particularly poor services in comparison to other areas, even by the already low bar set by society.
We either make a collective effort to prioritise cahms, SN education and family support services or we accept that incidences like this will occur with increasing frequency. That's not the current "blame the parent & forget about it" meme I know, but it's the only sensible choice. Pointy fingers and sucky lemon faces isn't working, and all our young people are left at increased risk as a result.