All the information I can get about Cole's life and the reason why he did what he did ( beat Peter up really bad) would affect my decision about what Cole should do. It's very important to know what his parents are like. But also how he has gotten into trouble many times before and still hasn't learned his lesson yet. Peter told on him for cheating on a test, so he had to teach Peter a lesson. But because Peter was in critical condition, the crime was a serious one. After learning more about the Youth Criminal Justice Act, if the crime is really serious, then the youth could have to go through an adult trail, and an adult sentence. Not only was this a serious crime, but Cole is also a repeated offender.
Getting to the root of the problem, the reason why Cole has done what he did, is important. Like how Cole has a father who beats him and a mother who doesn't care. Also how he needs people to fear him. This is could be because he fears his dad when he beats Cole, so he wants people to feel the same fear that he does when he is at home. But most people's lives at home are peaceful and full of love the majority of the time, and that could be the source of Cole's anger. A person with no support full of anger and power is not going to be person who really cares about much.
Thinking about Cole's life, I can understand why he doesn't really care about others and is always angry, but the things he does are a little extreme. If I just got told on for cheating, I wouldn't be happy either. But with Cole, he always has anger inside him, and adding on top of that his father's physical abuse to him, I can see how Cole would commit such a crime. But with that, he is a danger to society but does not deserve to go to jail. However, the attitude Cole gives during the Detention Centre clearly shows that he's not really sorry for what he did, more sorry for getting caught. But again, this relates to his constant anger at the world, and would need something like rehabilitation and reintegration rather than hard jail time.