#1 - Movie stars have (seemingly) charmed lives. They make a lot of money, doing something that they find fulfilling. They get to see & do a lot of exciting things. They are given special treatment whereever they go. We admire them for obtaining what we desire ourselves.
#2 - Most movie stars have an image; i.e. rebel, funny guy, smart babe, etc. We identify with their characters and live our fantasies through them. That is why, when a celebrity does something really unacceptable, we knock them off the pedestal that we put them on. We feel betrayed.
