That's what happens because in Buenos Aires less than half of the cars will stop at a real crosswalk. I lived most of my life in Buenos Aires, and I was flabbergasted when I moved to Madrid and learned that every car stops if they even suspect you might step on the crosswalk. Ten years later and I still walk them fearfully, while the natives literally step on them without looking at traffic. As it should be.

When normal crosswalks don't do do their job, it's only natural people will ignore then.