I think everyone is important, because if you think you are unimportant, and do something such as kill yourself, it will effect your family, who might have thought of the idea of a new fuel that the world survives on, but now they are too distracted with your death, don't research it, the world falls into chaos with no source of fuel for anything. Even if you don't effect the world, you could effect someone who effects the world. So everyone is important, because it is a chain. You might effect someone who effects someone who effects someone who effects the world.
Written in a rush, sorry for bad grammar.