His own drunken and erratic behavior over many decades is what made him lose that role. It took 60 women to bring down Bill Cosby. Do you honestly believe that the word of one minor starlet would cause a man with that cache to lose work? The studio only believed her because they had their own experience of his bad behavior. Because of their personal experience of him, her accusations were entirely plausible. In the real world, powerful men don't have their careers ruined by women - not even when they admit to having done what she accuses him of. Louis C.K. is a prime example. False accusations are exceedingly rare. On the other hand, women getting their lives ruined for speaking about what happened to them is commonplace.