The issue with Manson, compared to JD, is that he created frankly off putting staged persona and people not knowing him IRL do blend the persona with the person. So while I don't know him, I can see how he would use any piece of rumour to his advantage to further that persona and until Woods it worked for him and his career well. This might be the biggest hurdle for him to overcome with any jury, he's just not likeable. And honestly I have no idea about what he did or didn't do past his first few years after I grew out of him when my phase of rebellious teenager wore of.
You're thinking like a farmer, not Depp loving cat lady who doesn't know all of this and actively blocks anything unsavoury TUG does. He admitted to them he deletes everything regularly so people cannot look it up and they applaud foe being smart. Deppheads don't have critical thinking bone in their body when it comes to JD and any dissent is severely punished. They shunned Nick Wallis for being a proper jurno because he dared to speak to Amber stan and wasn't biased enough towards Depp. Laura Brockov, Jax, Christina Pykles who are the OGs are very luberal with block button and everybody follows and they were doxed themselves by Amber stans and weirdly enough jurnos.
And TUG is in and he milks it. With his cancer story, his girls having health issues, with pedos targeting little TUGs, being doxed and so on. With how he jumps fandoms he will be doxed for the fifth time soon enough simply because the new ones won't know he's been already.