This isn't to say that bad things don't happen to people that take every precaution, but all of the efforts (by nearly everyone I speak to either in person or online) to scare me into not leaving my apartment are tiring.
I like your healthy skepticism. Well, this city definitely has different layers, I know that I probably won't encounter any problems in Flores and Floresta while being cautious (I am very cautious by nature, which I think has saved my ass in sketchy parts of Latin America, on a couple of occasions) but if you end up too much towards the south it's a whole different story already. Mataderos, Liniers are a bit more sketchy, and Villa Lugano, for instance, is definitely dangerous in my opinion, even when you are not carrying anything of value.
Every time I saw Mataderos from the highway when coming from Ezeiza, I definitely felt glad the bus would not drop me off there. But there are also nice parts.... definitely very unpredictable.
So, I think that many complaints about the many supposed dangers on the streets of BA are exaggerated, and I have never really felt unsafe in regular areas. But I definitely won't cross into Dock Sud, and I have to admit I feel very uncomfortable in La Boca, even during daylight. At the same time, I have also been in Nueva Pompeya and many parts of Barracas and I felt absolutely fine there, just knowing that I was not carrying an expensive camera and crazy Rolex watch.
And believe me, I have done some stupid stuff too, like all people who gradually made this place their home.
http://es.wikipedia....iki/Isla_Maciel
And this is like a small piece of Congo:
http://avellaneda.clarin.com/ciudad/Senalan-autopista-Plata-Dock-Sud_0_856114388.html