I would agree. It is easy in hindsight to think you should have called..or why wouldn't you. I am sure the neighbours who did hear something wish now they had of done something, but as I said its in hindsight. SOmetimes, you aren't sure of what you heard, will wait to hear more and if nothing you don't think anymore. If something was prolonged shouting screaming and escalating you may be more likely. Again I guess it depends on what the sound was as to whether it alarmed you so much as to feel you could not let it go. I know there have been times I have thought should I or shouldn't I ring..am I overreacting.. Not so much as not wanting to get involved..just unsure of what you heard.. When it was only a brief sound, perhaps as they didn't hear anymore, they let it go.. if it had gone on, with more noise/screaming, then maybe they would have rung. Hard to know..and don't think you can blame them, I am sure they are wishing so much that they could turn back time and report it- if they did not.
By the way, thanks to all those you are at court or posting tweets and keeping everyone updated. I have not been on here much for awhile- though check in everynow and then- but haven't had much to add.