Ashton Kutcher and Mila Kunis Apologize for Danny Masterson Letters

Apology for letters supporting Danny Masterson, who was convicted of rape.

Letters written after Masterson's conviction, sparked backlash.    

Masterson denies allegations, appealing conviction.     

Kutcher and Kunis support victims, say sorry for pain caused.        

Apology met with mixed reactions.        

Reminder of complexity of sexual assault cases.          

Celebrities not immune to public scrutiny.            

All have role to play in preventing sexual assault.              

All have role to play in preventing sexual assault.