I was just reading "The Family Inside" on the recommendation of an online friend and there was a large section on their opinion that introjects are different than persecutors/abusers and how some can be reframed to join the system while others might have to be asked to leave. I found it interesting, but so far it hasn't applied to me. All my persecutors with introjected messages (so far) have an obvious protective function that my Observer has been able to analyze. Before I had my DID diagnosis, I was having the hardest time with these screaming abuses and uncontrollable compulsions to punish and not knowing why I was getting taken over by those "states" or "modes" as I called them at the time. Around the time that I started really seeing some of these things as separate parts (after my therapist was pretty sure, but a month or so before diagnosis), my Observer started to pay really good attention to what triggered them.
90% of the time, I've noticed it has to do with putting myself in a vulnerable situation (from their perspective) by defying the "rules" that we have used to keep ourselves safe or as a way to get overwhelmed little ones who are taxing out the system, causing dangerous situations, to calm down. In both cases, these were meant as protections. My caretaker (CT) has outright said to my T: "If your kid is playing in the street, you'll scream at them, drag them roughly back to safe ground. At the moment, all that matters is the danger." T tried to argue with her that he's not dangerous in that way, but she feels he hasn't proven that yet, because of a bad reaction he triggered in the kids in late April. My Big Brother part explains that he has to use violence to "disconnect" (scare deep inside) other parts whose intensity is dangerous (threatening to our well-being). I don't want to trigger, so I can't say exactly what he said, but he was basically espousing his way of regulating as the lesser evil, considering the consequences.
So, I started "re-framing" these parts instinctively weeks or months ago, with T's cooperation. It's hard to do in the moment the internal abuse is taking place, but I do find myself being able to go back afterward and say, "OK, I get it. When you were doing _____, it was because _____ didn't seem safe." And then I have to seriously consider if I was pushing us into something that wasn't safe (i.e. too fast or helpful to one part, but harmful to another) and take ownership of that. If I really think it wasn't an issue of being unsafe, but a perception of unsafety based on past experiences in other relationships, then I have an opportunity to ask those parts what would make them feel comfortable, allow them to risk trusting that the situation actually is safe. This is mostly, of course, in my work with my T.
I will give an example. Both CT and BB have been putting up a wall (kinder than the way they used to regulate) against letting a little one get to T. This little one loves T so much and wants to be closer to him and has stuff she wants to tell him that she says she will only tell him and not me.

Anyway, when we first did interviewing (about two weeks ago), T asked about her and they just wouldn't let her out or near. We have spent most of our last three sessions (two phone sessions, one office session) just discussing what sort of things were causing the blockage and how T and I could address them together. They were things like:
-CT wanted an outright statement that T would be safe "in that way" to these kids, like a vow or a promise.
-BB wanted environmental changes that made the room less intimidating for everyone involved.
-CT and BB were both concerned that this little one wants affection from T, but T will be unable/unwilling to give it (or will respond badly to her loving him, other things she might say) and hurt her so badly that there would be too much instability. So, there needed to be some very focused conversations on physical contact, boundaries, etc.
-CT was worried that if T might not have a plan in place to deal with the overwhelming attachment that was going to surface and would make another sudden withdrawal like the April incident (we still need to talk about this a bit).
-BB needed to know that T would give appropriate attention and time to the grounding process if he was going to be expected to not utilize his "more efficient" methods for disconnecting the little one in the throws of separation anxiety.
Anyway, these are the kind of things that my "persecutors" worry about, even as they are saying and doing very hurtful things to the others inside. Their basic message is, "Do not get close. Close is not safe. No one will love you." But, it's not because they do not want these kids to receive the love and care that my T is offering. Rather, they fear he will change his mind, will be like past people, does not have enough in them to give (the kids needs are beyond meeting)...that the result of allowing them to attach and share their hurts will be more pain. That T will tell the kids they are bad, weak, liars, manipulators, etc. So, to lessen that sort of a blow or keep the kids away, they are constantly telling the kids those "old messages" and projecting them onto others who we get close to. They have been doing this job for years, which is why no one really "knows" who we are...
Anyway, I don't know if that has helped at all, but reframing is the only way I have to deal with these parts and the one that I instinctively used from very early on, before even having an inkling about DID.