Abusers select their victims, or take advantage of those around them. They need someone they can impress. Someone who will ‘admire’ them.
When they encounter a person uninterested in them, they move to someone else. They seek victims, for without them they do not feel alive.
As Vampires who need to feed on blood, so too the abuser. Without their victim they are angry and frustrated, and do not know how to cope with life.
They need a victim to make them feel better about themselves.
Without a victim the Abuser deteriorates. He might wind up living on the street, exhibiting all sorts of signs of depression, insecurity, etc.
To be whole, the Abuser needs a victim.