In the case of the alleged 'fact' that "the papers" have reported, it will become a fact for me when the BBC investigation into the fracas states its conclusions, soon. This approach is no different from not assuming someone else accused of a crime is guilty until they have been proved to be so, an approach that is supposed to be enshrined in our justice system.
I don't know how likely it is that JC hit someone as I don't know him personally. One or two people who do know him personally seem quite supportive of him. That could be significant or they could be smarmy bastards with agendas of their own. I have no way of knowing either way. Neither, I suggest, do you.
It seems that Mr Tymon, the producer who is supposed to have been abused, is taking a similarly cautious approach: apparently he "intends to await the outcome of the BBC investigation and will make no comment until that investigation is complete".