I do believe all sorts of horrible things happen in Hollywood. I believe Joss is part of that (though funny how he got his own medicine in the Buffy movie of the 90s). I expect it takes a certain personality type to thrive there, just as it does on the fast track of corporate and criminal organizations and politicians.
But at the same time I think of things like the
Dreyfus Affair (note, I'm reaching that far back in time to avoid risking my post being transferred to the political thread or to start an unrelated debate, there are certainly no shortage of similar examples since then all the way into the modern day) in which even evidence of innocence was transformed into evidence of guilt just because of how people, who either hated Jews or just already believed the worse, did mental acrobatics to make everything make him look even more guilty so that proof against his guilt added up to proof FOR his guilt. It was a miracle that he was pardoned (which I'm sure most weren't), and he's just one example.
This has only become more pronounced in an era of fake news (where even foreign teens make money selling Americans the fake news they want) to people on twitter and the like deliberately lying, cutting and pasting to deliberately misrepresent context or even invent outright fiction, and the like, and seem to do it for no other reason than the same sadistic, self-righteous addicted posturing of a child in middle school spreading gossip to outrage and shock others.
Furthermore, Hollywood seems to be filled with narcissists (which actually makes sense to me as well), and I expect Joss is one...as are many if not most of his accusers. On top of that, celebrity news thrives on scandal (and often times, so do actors that find that notoriety helps them more than harms them, sometimes even when they have to flee the US and work from another country).
In the end I remain cynical of Hollywood, yet treat all these reports as in this thread with skepticism, and figuring both sides to be toxic. 'Course it beggars belief that so many making these allegations can't ever make use of legally acquired electronics (that can look like a button, or even just a hidden phone that's recording, as plenty of children have used to bust violent and atrocious teachers)...while such evidence is often barred from a court of law, it seems the court of public opinion is actually much harsher anyway. (But then if that became a thing, deep fakes would become all the rage.)