Pain is caused by those "perfect" people with everything they need. They look down on the other people that have nothing and drive them into pain. The pain of knowing you have only yourself, nobody else.

People cause Depression.
Depression leads to hurting.
Hurting leads to death.

Most people have killed once, knowingly or not.

Love blinds us to see the thruth.
But I am so blinded by the thruth that I can't see the love.