The "facts" are that Biebel's enough of a scumbag to get out of the car to film and cheer while someone is beaten unconscious for the crime of having an uncovered human body. If that's not enough to sever ties, I'm amazed.
Whether or not he knew anyone involved, whether the naked person was mentally ill – whatever the answer to those questions are, that doesn't change the fact that what we KNOW he did is horrific and disgusting.