Humans are different. Unlike any other animal, they are ready to die for their beliefs. Monotheists an rationalists regard this as a mark of our superiority. It shows we live for the sake of ideas, not just instinctual satisfaction. But if humans are unique in dying for ideas, they are also alone in killing for them. Killing and dying for nonsensical ideas is how many human beings have made sense of their lives.

John Gray, Feline Philosophy