Parents know their children far more intimatley than the state, teachers or GP's. Apart from some exceptional cases, parents are able to offer support and care and most importantly, love and continuity, to their kids.
State intervention into things like Sexual, drig related or bullying experiences, may offer short term fixes, but can cause a breakdown in the parent / child relationship which in turn can have far more damaging effects on the childs' life.
Simply put, a childs welfare is, and always has been, the responsibility of the parent / family first and the state [a distant] second. Even though children mature at differing ages, there must be a defined point where a child becomes an adult (and this is 16 years). The state, therefore should respect the right of the parent to protect their child.
If copuncilling is needed, perhaps it is the parents who need the councilling to deal with their child's issues as a parent.