Not that incidents like this don't occur in other cities in the world, but it shows that avoiding dodgy areas at night might not be enough.
The only other place I have seen it like the above is the gypsy kids in Rome. Even then though they were more slight of hand pick pockets than the blatant assault in the video.
Almost 60,000 people were murdered in Brazil in 2014, most with guns. While some Latin American countries have higher per capita murder rates, in absolute numbers, Brazil is the deadliest place in the world outside Syria.
Brazilians are far more likely to be shot to death than Americans, a more populous country where there are about 8,000 to 9,000 gun homicides each year.
...
Right now, Brazil actually has tough gun laws.
More here: http://www.npr.org/sections/parallels/2016/03/28/472157969/b...
I've had a phone pickpocketed from me too.
I guess many officers think arresting someone underage is not worth the trouble, unless it is some life threatening situation.