What's the meaning behind Pink's Neo-Nazi rebirth?
With the album and movie, most of what's said and done is pretty parallel to events in the lives of Syd Barrett (the rock star descending into madness) and Roger Waters losing his father to war, this sort of loss, it's not surprising his mother would 'mother' him a bit too much. I don't know fully the truth of the estranged wife either really, whether truth or fiction for him or Syd, that doesn't seem too far fetched.
Obviously, in the story of "The Wall" the Nazi rally didn't really happen: But even as a hallucination, what brought it about?
The only thing I've heard on the subject that even begins to relate was Roger Waters eventually getting disgusted with the audiences that wanted to get wasted, yell and rock out over their increasingly dynamic music. He got so upset with a particular audience member (or group) that he spit on them. In hindsight, it sickened him that he would do that (part of what built the literal Wall at concerts). This is what I heard, but it seems far fetched to move that to a Nazi hate rally.
Admittedly, I haven't dug too hard, but why did Pink go to such a dark, racist and hateful place in his mind? Obviously he went through a lot that would make anyone angry... but specifically towards minority groups?
Edit: I see it obviously confirmed in the FAQs that it wasn't really, but a hallucination brought about by the mystery injection to keep him going in Comfortably Numb. That was pretty obvious, but I don't know of any drugs that turn you into a Nazi.