How to they come up with these numbers?

Teen gets 53 years for killing, dismembering rival

Kolb read a statement to the judge after witnesses testified that she was a good friend and student who endured a tough upbringing that included being locked in her room as punishment and being harassed because of her bisexuality.

Kolb said such experiences left her numb, unable to experience emotion.

"I was so good at not feeling that I felt no feeling as she died," Kolb said.

Don't they have a word for that? Oh right. Sociopath.