I agree with the point that it's a multi layered problem. For example, Sure Start was introduced (thanks Blair government) because the research is irrefutable. Invest in early years and there will be less problems with the children who benefit. Less crime, drug use, mental health problems. The centres worked with 'hard to reach' parents in deprived areas. David Cameron started closing them because he said, they were only used by families like his own who didn't need the support (and could afford to pay for it). I do wish he'd come to Oswaltwistle, Burnley, Blackburn etc where the number of families in need no doubt exceeded the area he lived in.
Probation was privatised. It's in the process of being taken back into public ownership because it failed in a big way. I don't understand why anyone would believe profit should be made from prisons or any other part of the criminal justice system.
Secure Units, like the ones where serious young offenders are held could be viewed by some as 'too soft'. Young people are given education, introduced to sports and hobbies, they have 1 - 1 support from a key worker. So young people who have committed serious offences, often including significant violence are cared for, rather than simply locked up and fed gruel. Often, by the time young people get into such establishments there is no guarantee their lives can be turned round. But, for some, they are.
We need to invest in our children, their parents, in the criminal justice system and the public services decimated by austerity.