Thing is, McFarlane didn’t have incontrovertible, indisputable proof, which is what it would take for accusations to succeed at that point. Without that, you lodge accusations as your peril. As Ralph Waldo Emerson put it, “Never strike a king unless you are sure you shall kill him.
That's certainly true.
But you could contrast McFarlane with the comedian who took on Cosby.
McFarlane was hiding behind the joke, not taking the allegations entirely seriously.
Whatever else you could say about him, Hannibal Buress was definitely one brave guy.