It's not 100% to judge intent, but when a Marchisio idiotically leaves his cleats up during the course of play, that's recklessness. But when someone bites another player, that serves no purpose other than malicious harm to another player.
One is bad football. The other is bad kick boxing.
Argentina winning this WC in front of the Brazilian supporters would be one of the greatest troll wins ever so i like to see that happen not that i like the Argies.