I don't have time to read all of this. But I do believe the answer to badly behaved childen is expulsion and this is something that needs to be funded in the context of special units for those who are destroying the opportunities of the majority who can behave. Further, such children need to be supported in the context of acceptable boundaries because when they start work, if they start work, no exceptions will be made for their backgrounds if their conduct is as unacceptable in the workplace as it is or has been in the classroom.
I speak as a parent who removed a child from a top 100 comprehensive becuase the behaviour of a significant minority was not being managed, was not being dealt with and was impacting the achievement of the majority. We had the means to remove our child, many parents do not. It is disgraceful that the education system has allowed the achievements of the majority to be diluted becuase there is no remedy for the minority whose behaviour is regularly criminal in nature, ie, assault, theft, intimidation, etc.
Not acceptable; not a feather in the cap for the teaching profession which excuses it. There are many many children from difficult background who are not destroying the opportunities of the majority.
I have one child who has been independently educated since the age of 8 and one since the age of 13. In the independent sector expectations are clear, sanctions are clear, boundaries are clear and consequences are both clear and disseminated.