The Parents Television Council is taking aim at pop star Rihanna over the video for her new single 'Man Down', which opens with a graphic scene of the singer shooting an unarmed man (who we later learn had raped her) in the back of the head. The artist took to Twitter to defend herself: ''The music industry isn't exactly Parents R Us! We have the freedom to make art, LET US! It's your job to make sure they dont turn out like US.'' [VIDEO]