GRAER (Brazilian Special Commando Police) Air Unit takes down bad guys...Is crime so bad its at insurgent levels in Brazil?

You don't find much on GRAER Special Commando Police Air Unit....I assume its just another one of the Gendarme type units that Brazil seems to like so much.  Below is a vid of the unit in action taking down a bad guy.  What has me wondering is the tactics being used.



To fire from a helicopter, even if you're employing a trained sniper, in a residential area with civilians out and about makes me wonder.

Is crime so bad in Brazil that it should be considered almost an insurgency?  We're seeing tactics being used that seem more appropriate in war zones than in a rapidly developing country.