I'm going to hold off on judging here. How many times have you heard some thing horrible that someone did and everyone around them was like "I'd have never expected that from them" ? He may not have known about the abuse in Manson's relationships. Maybe he did, idk. But heck, even serial killers families and close friends have said they had no clue that their loved one could be capable of such things, so it's possible that Depp had no idea what was going on in Manson's personal relationships. I feel like in most cases of abuse the friends of the abuser, don't really know that their friends are doing such things.