While I don't agree with the sentiment of less fire arms. I am happy, that the man/woman is in custody. Hopefully they rot. No kid deserves to have their life taken from them.
Desperation for attention or acknowledgement. Anger towards peers. There are many reasons why. Unfortunately, none of them are truly worth any loss of life. Usually it's a mix of things, Often mental illness plays a role as well.
Imagine being a kid going to school and having your friends shot down. Hopefully the bastard get's what is coming to him.
Why? I mean, take your own life if you're going to take any.