I've been a Hamilton-fan since 2009. I've given up. On him, on his antics and most importantly: on defending him.
Throughout the last two years I feel like the only purpose of my enthusiasm towards him was defending his idiocy off and partly on the track. I don't have a problem with him not winning a championship for multiple years now (and let's be honest, 2012 is not gonna be his season anymore), I wouldn't even consider giving up on supporting him because of his move to Mercedes as I've never supported him only because of his success - surely, it was part of my support but not the most important one. Alonso hasn't won a chamionship since 6 years now, but it's so much easier for his fans to defend him in a public debate or discussion because it's his driving which is in the spotlight of the media, and not his private life (or at least no embarassing aspects of it).
Hamilton's career started to go down since his father stopped managing him, and since Lewis hired Simon Fuller to take over this job (unsurprisingly, it has been one of Nicole's ideas to do so). Fuller is the perfect solution for sportsmen who are past their prime (not in terms of age, but in terms of performance) - the prime example is David Beckham, who (let's be honest) has never been as much of an extraordinary player as it seemed and the only reason he has reached this kind of popularity was because of his presence in newspapers and all the stories about his private life. Lewis has taken exactly this route now. As soon as he couldn't set any special results in F1 (he finished 5th, 4th and 5th again in the last 3 seasons) he was keen on having his name in the papers for as often as possible. This is the Simon-Fuller-concept and unfortunately Lewis is naive enough to believe it's the right step for his career.
It's the bad influence of his girlfriend and his new management which is getting him into trouble, but he's also not mature enough to draw a line and realize what's doing him good or bad. He's a 15 year old, captured in the body of a 27 year old, and while casual people get more mature when they get older, it's the other way round with him. He's the Benjamin Button of F1.
With his ongoing attitude, he may very well get the amount of recognition by the media he desires to have, but he'll pay a very high price for that. The price of never achieving what he did achieve in 2008 again, the price of having to watch all the Vettel's and Alonso's take away titles and the price of becoming a second Montoya or Villeneuve. One could say that this is already more than many could achieve, but with all the potential on Hamilton's side, it would be sad to see his career ending like this.On the other hand: He had it in his hands, he had the opportunity to take the right route, in the right team and with the right people around him. He had all of that, he has given up all of it. He's finished. In my opinion.