Anniebach
How can seeing the arrests cause informed debate?
I'm not an expert Anniebach in such matters but I'd imagine that those who are involved with young people; educators, those involved with their wellbeing and mental health, and parents, also politicians, will all be shocked and alarmed that juvenile minds can contemplate such horrific acts of cruelty, and will want to look at and debate why?, and how to recognise certain traits in children that might indicate they are treading a dangerous path - and what to do about it in future.
Knowing the names will allow such people to examine their history, their behaviour - especially at school. And presumably allow the 'informed debate' that the judge mentioned, the idea being to prevent this kind of horror from happening again by early intervention when such children show signs of deviant behaviour?
My answer is simplistic, but I can't think of any other reason why the judge lifted the ban on releasing the names of the killers. As has been said, local people will probably already know the names of the two involved. Informed debate is better than wild speculation which would prevail if they had not been named.