Score could goes more humiliated for Argentina, luckily Brazil showed mercy to them, they stopped pushing quickly when the score is enough to win the game. Neymar scored his 50th international goal and he put it into Argentina's net.
It was an international games and even when they win big time against argentina it wont really makes any different because all they need is to win and get 3 points to stand on top for the world cup qualification. There is no point in wasting their stamina to try to score more goal when they have won the game