They came from all different walks of life but each of them ended up in the same place.  It just took some a longer time to get there.  Sometimes it was the development of a power, a feeling, or the first time a parent looked out of the corner of their eyes at their child and felt fear.  It seemed more like a curse than a gift.  Normal people found they couldn't stand to be around them for too long, it drove them mad or worse.