Why?

Why are we so self-centered?  Why do we all experience the same things, the same depths of emotion, yet feel that no one else can possibly understand?  Why do we need other people so much and why can’t we REALLY bond with each other?  Why do we all have "dirty" secrets and darkness hidden within?  Why do child molesters exist? Why are we never content with what we have?  Why do we constantly search for answers?  Why do we all make the same mistakes?