What reason? Why not in the United States or China which is a super power country in this earth. No need to think complicated to express why. It's only because the flag. Yes, the flag. Because the flag is a symbol for easy to understood. Try see the flag of Brazil. The flag is always graced the World Cup. Because of frequent Brazil team nominated for the grand event that world football.
What picture? Yes. It's got the ball planet.
People who are on vacation or traveling abroad for example, what he will go straight to the tourist destination or a place that will stop off? Of course not. He will go to the embassy first to find out about places of destination.
So is Alien. They consider that Brazil is "embassy" of sort certain planet that they are headed. So it's not a coincidence that they appeared in Brazil..
