The extra footage included in AB’s “Theatrical Cut” was apparently due to a mastering error/misunderstanding. For some reason, an entire reel of the film was replaced with a corresponding reel from the “Director’s/Cannes” cut. This is pretty unforgiveable, as it makes a hash out of the dock scene: instead of including the entire extended scene from the longer version, it only includes the back half of it.
As for the motivations of the ghetto people in not wanting to put down their beloved dead ones, the priest has an extra line in Dario Argento’s edited-for-Europe version that is more explantory:
“These are simple people. And they have little. But they do not give it up easily, and their dead, they give up to no one.”
Given that line, I think that it wasn’t so much a question of the ghetto tenants being unwilling to shoot the zombies as much as it was a tenacity on their part to take care of it themselves, on their own time and terms, rather than let the National Guard do it.
This makes sense; after all, if my relative or friend’s corpse needed a bullet through the head, I’d like to think I’d do it myself and not have a stranger do it.
If you haven’t already seen this version, I recommend it; the subtle but effective changes Argento wrought (added lines, shots, scenes and music as well as the deletion of material from Romero’s version) makes for an interesting comparision. The “social commentary” themes have been mostly deleted, along with the bulk of the slower passages, while much gore and action has been added that makeas for a pretty straightforward film. One can hope Anchor Bay includes it on their upcoming box set, because there currently isn’t one DVD release of this version around that doesn’t look completely awful.