As a pedestrian I never expect the drivers to follow the rules. I follow the rules (I only cross when the light's green for the pedestrian, etc) but I also make sure multiple times before I start walking that no one is about to murder me.
GS_Dirtboy and ElQueso have put down "rules" which sound kind of like Saudi Arabia and Dubai (only its 10 times worse in those countries than in Argentina) and so that might be the reason I am used to this insane way of driving. This drives my wife, who is Argentine, up the wall because she lived in the US and learned to drive there. She just can't fathom how someone can be so idiotic, irresponsible and selfish on the road (both here and the middle east).