Some of this might include some of the same things in another Depp twitter thread that was posted here a couple days ago, but I saw some things that I don't remember seeing when I read that thread.
The one piece of evidence that should have shut this whole thing down was Amber's phone video of Johnny trashing the kitchen in a drunk violent outburst. That behavior is abuse, and if he hadn't done it before - probably more than once - she wouldn't have known to catch it on video. She doesn't have to be a perfect victim, or even a particularly good person, to have been abused. He claims she libeled him by calling him an abuser; he's shown to be abusive on video; that should have been the end of the story.