Also, can you prove your claim with facts?
I should have put a comma there, he stabbed her 11 times for rejected him.
"Everyone acts differently" is okay for a lot of things, but no... stabbing someone as revenge for anything non-violent is not one of those things. I'm sorry. We may have a fundamental difference here, but it is what it is.
I've never understood this idea of 'premeditation' in crime. All crimes are premeditated, you have to process the thought before you execute it. What does it matter if it's thirty seconds before or three days? If you walk in on your next door neighbour having sex with your wife, and you happen to keep a loaded handgun in the top drawer right next to the door, you're still deciding to take the gun out and murder them.
I've never bought the concept of people 'just seeing red' or whatever.
I had serious anger issues growing up and early adulthood, I would react instantly in much harsher ways initially than if I took a few seconds. I can completely understand the concept of 'going red'... but sure, let's take that out of the equation.
He still attempted to murder a girl because he was rejected by stabbing her 11 times in the back. This wasn't self defense, and it was still a crime. I'm not advocating he get tried as an adult, and of course he should get mental help while he's in juvenile... but mental illness is not an excuse for these actions.