A parent has a unique ability to wreak havoc on a child, seconded by other figures of power such as teachers. A parent also does not get to choose which memories a child holds dear; an annual trip to the beach filled with joy and ice cream may hold less of an impact than a single day when the parent was angry and behaved poorly. This affects everybody.
I do suspect it affected Moonbeam more, as he harks on it constantly and tirelessly. To do so he is constantly reminding himself of the ways his parents let him down and hurt him. And if perhaps speaking on it regularly somehow is therapeutic, he has turned his readers into mere whipping boys, who suffer his habitual addiction. His posting history shows he has become more desperate in his views over the years, so I am not inclined to think whatever he is doing is working. It is certainly working if the goal is to marginalize himself; he is roundly mocked in P&N and has only himself (and probably his mother, of course) to blame.