We have two complete opposite but raised the same children (no criminal involvements though of course-just different personalities) - but what is your suggestion re a 15 year old convicted first degree murderer, especially if it proves to be as physically violent as I suspect this is? Try to rehab them?  Pretty certain this 15 year olds prior history will be made public. If yes  do we want him walking free ever among us? Immature children do not perform cruel murders. But mentally ill ones do. And by age 18, if they are free in society, they can choose to take their meds or not.
Poor little girl.
Sad sad. So sad.