Not that you asked me, but living here i wanted to share my two cents. Buenos Aires is not tragic at all, it's... just a little melancholic. A tiny London with poor people and too much humidity, but with great people, lovely architecture, and well, there's insecurity, no way to deny it, but it all depends on where you go. You can walk, travel, go out, party, do whatever you want and you won't feel paranoid or anything. Oh, and there aren't as many escaped nazis here as in the movies, either.
Thanks :-) Comparison to London makes me feel better about Buenos Aires. Puts thing into a context. I actually used to live in North London, in a semi-rough area. Even though London was an expensive mess and certain areas gave the feeling of insecurity, I still liked it...at least it was an interesting mess.