How would you justify?

How can you justify an 11 year old coming to school with a gun threatening to kill 3 of his classmates? Sure his classmates may have teased him bully him and even stole his lunch but how can you put a value on 3 young human life.The problem with this is you can't. How can you justify an 18 year old being crushed by a jitney driver? Sure he stole money from him and the driver is the sole breadwinner of his home with 7 children to feed but what is the value of human life? The problem with this is you can't justify it. There are many things in the world that cannot be justified. I have thought about it and am sure persons in the legal system have thought about it. The simple problem is you just can't.