To kill one's own heart is a task easily encountered.
But a heart can be healed, and brought back to life. But what could happen in the time it was dead? What horrible things could a person do, shielded by their hurt?
Emotions are nothing but lies; a chemical reaction in the brain. Something that could not exist without interaction. Humans cause negative feelings, and therefore humans are evil.
What are we, as a race, capable of?
Those who kill their hearts, also kill the ones they love.