The title of your post sounds like a racist, I do not see the problem of the Brazilians staying around, I know there are a lot of afk players, the game has a tutorial in the English language ...
The number of South American players has been growing thanks to the number of players, recommendations from friends through social networks, youtube, facebook, etc.
Most Brazilian players are not inactive or aggressive as some say, so I'm sure people who say that, because they did not live with us at all