Check out this MJ's private phone conversation where he talked about Joseph beating him, calling him "too black" and "big nose". Michael also talk about Joseph having sex with a different girl in another room so Joseph was cheating on Katherine. Does this sound like Michael Jackson talking in private and a private investigator was bugging the phone?
https://www.youtube.com/watch?v=fkWEiWGvXVk
https://www.youtube.com/watch?v=fkWEiWGvXVk