Uhh...personally, my own neighborhood, they're fighting and chest-beating and arguing at all hours of the day. They'll no joke yell at each other full on at 2am. They also have all sorts of people stopping by for 10 minutes and blocking my friggin driveway, also at all hours of the day. They're bad people, and I really don't care if bad things happened to them. I wouldn't help them. If I hear a full on fight/shootout or a woman screaming (from that side of the fence anyway), I hope by morning the police would have thinned those pack of dogs over there and throw someone in jail, though I don't have much faith in that....police go there repeatedly and just slap their hand and tell them to stop. Fighting. Arguing. Music playing. Selling drugs. Yeah they can burn.
My side of the fence though, I may help. If I can hear a guarantee rape or a murder going on (danger to life or limb), I'll help and I'll probably bring a firearm. If it's just regular domestics, not my business enough to intervene.