To all those asking why, that is the easiest part for me now. Before I moved to Brazil I wouldn´t get it either. Biting is reserved for small children and untrained animals.
However, you go watch some street football in the favelas of latin america and you will see this and much much worse. It is a weird combination of animalistic instinct and playground football as I knew growing up in the UK. All sorts of weird hair pulling, eye poking, biting, rabbit punching, spitting etc. So that is where Luis learned his footballing/competitive instincts. Not in some lush academy with professional coaches.
The thing is, this background is exactly why we love Luis. Those instincts are what sets him apart from the rest. How many times have we seen him predict the seemingly unpredictable (Uruguays 2nd against England?) or fight his way through an avalanche of tackles, miraculously keeping the ball for us to score (v Man United setting up Kuyt). Players like that don't come from academies, they are created in the hell that is a latin favela. If we want to have a player like that then we will have to accept the occassional moment of madness.
Something I haven´t shared with anybody before is, I cried the first time I was in a favela. I had recently become a father and seeing what can only be described as ferrel kids running around was upsetting enough. I was with a Military Police fire officer at the time who was explaining how they all live at risk of landslide or their housing collapsing at any time. Every day he gets called out to pull a family out of the rubble of their house which they build themselves with zero understanding of architecture or construction. When it rains, entire neighbourhoods are literally washed off the side of a mountain. Thousands die. They start rebuilding the same shitty houses in the same insane places the very next day. His job is to visit these people and get them to sign a release saying a government official has explained the dangers of their living environment to them so they cannot sue the state when tragedy inevitably occurs.
"Sign a release, you mean convince them to move right?"
"Move where? I thought the same when I started this job, I'll be the guy who makes a difference. Their starting point is that the government doesn't want them here, they want them out so they can build beautiful condiminiums with amazing views on these hills. I was attacked, spat at, you name it. Not once was I listened to. So now I get the signature and I leave."
Those who want to be judgemental really should spend a moment walking in those shoes.