WA: mystifies me

From the King County Journal:

Motive often remains a mystery when kids murder their parents

His mother bought him the rifle because he was a history buff and it looked like a weapon used in the Vietnam War. She wanted to encourage his interest in history, she said.

One evening in January, the 16-year-old Ravensdale boy emerged from his bedroom with tears in his eyes, leveled the military-style SKS carbine at his father and pulled the trigger.

He told police he thought his dad was going to hurt his mother.

Since that still-unexplained shooting, prosecutors here encountered another case of what experts call parricide, the act of a child taking the life of their parent or guardian...

It's not just the kids whose behavior is puzzling...