Comment: Mercy killing... child on child killing... postpartum depression killing... manslaughter... swerved to avoid child lunging onto street then hitting child on sidewalk... somebody drugs you with a hypnotic, and suggests the child has a gun so you needed to protect yourself... kid cuts off dog's head with an axe, so you slap him, killing him (unintentionally)... 

We haven't even arrived at the obvious circumstances yet.