At what point should consumers, stop supporting celebrity careers?

With the latest scrutiny of Bill Cosby, and his admission of drugging women, and having sex with them, does that mean that the Cosby Show wasn't beneficial? Does this mean that he didn't serve any good to our community? 

Being that Afrikkaa Bambatta has been accused of raping younger boys in the Zulu Nation, does this mean that he didn't serve any good in the Hip-Hop community? 

Should we stop supporting the careers of celebrities, because of the immoral acts they commit in their personal life?