Madgran -- You would have to point those posts etc. out for me. I can't think of any, let alone "quite a few" parents taking responsibility.
Sorry no recollection of user names and as over several years that I have been on GN, I doubt my brain will dredge them up to my memory.
Added to which I tend generally to focus on what is being posted rather than individual posters/names so even less likely to dredge the names up. If I do I will let you know.
I don't recall a parent actually posting on an estrangement thread after they have taken responsibility, seen themselves totally at fault, rectified it, healed themselves and now having an obviously blissful relationship with their EAC ...I agree with you there, Friendly Ghost is such an amazing exception. Well done you Friendly Ghost for bothering to come on here to try and help others.
However I have definitely seen estranged parents who are worried, upset, trying to work out what to do ie in a process (something we all have to go through when learning, growing and making decisions) saying that they know they have made mistakes, done the wrong thing, spoken out of turn, had the wrong expectations etc and now don't know how to rectify things. I have definitely seen that