the worst is true: MA teacher raped before being murdered by 14 year old student

[4Q2u2]

235. Justice System for Whom?

Is not the Justice system set up to speak for the Victim, who's voice cannot be heard? You seem to be advocating for an age distinction for the defendants when the advocation of the Justice System should be directed for the rights of the Victim.
If he is tried as an adult there are avenues build into the system for his legal team to still argue diminished capacities.
If he is convicted there are other avenues built into the system in the sentencing phase to mitigate penalties.
If he is incarcerated there is schooling, training, and rehabilitation programs he can opt for to change his life, as well as reviews for parole that can and do change sentencing penalties. All these things are afforded him, so to say the system is not advocating for him is not completely accurate.
The justice system is the people's advocate (and hopefully the victims) and his legal team is his advocate.
You speak of emotions not making decisions for justice. It seems that you purely looked at his age and decided that he is some poor 168 month old baby.