The Legend of Billie Jean Trailer

I couldn't find a trailer for the movie, so here's the video for Pat Benatar's theme to the movie, the song "Invincible". Originally posted to YouTube by CourageousJohnny, this video features clips from the movie while Benatar sings in a trash-strewn setting. Ms. Benatar always trashes this movie before she performs this song at every concert she does. Why?