There are official statistics somewhere, google it. I know that crime (the really bad kind of) is lower than in 2002-3 and getting lower,and note that murders and such cannot be underreported,those go directly to the official numbers. Muggins get underreported, obviously, but those are not the kind of crimes that one should worry about so much.
La Nacion loves to put serious crimes in bold letters, but even when they are true, they always find a way in LN to tweak them with lies and errors (a crime committed in Rivadavia Avenue is reported as happening in the Autopista del Oeste, any crime near the Moron district is reported as being IN Moron -because they don´t like the social-democrats that control the district, etc. La Nacion is a bunch of scaremonging "journalists". Everything in that newspaper is twisted to throw the government in some way or another).