Webber was still in position to defend and had the inside line advantage in overtaking but he was at a position that Hamilton maybe was sure he had passed him while he hasn't. He closed the door to make the overtaking complete but got it wrong as Webber was still coming. Seems like a racing incident and by the way the stewards dealt with it also seems like that was the conclusion they got.
People are playing the colour thing too soon and sometimes in a way that generalize things to a point where they are the ones being racist, even if by good intentions towards Hamilton and even if they don't belong to the same race as him.
Ringo, beside what I just said have in mind Webber was indeed attacking at that moment but the overtake was not complete as well by any means. Hamilton was unlucky to get a blind spot and close the door as if he had completed the move. Actually if there wasn't a crash it would have been a big possibility that Webber was going to keep an attacking position for the next couple of curves as a result of being in physical position to do so. As for Kubica, he simply behaved better even if also being aggressive. But that's because he had the opportunity to see that he had someone by his side.
Things were not clear as day by any means, even the stewards took a lot of time to decide. And wile Hamilton is very good he is not on par with Serena Williams or Tiger Woods. His combination of lack of luck and over aggression at many times made his career results much worse than that of those athletes. He has a lot of technique and that is no doubt, as those other two, but it's also part of him to go for over powering many times while in pressure. Just like Vettel if that makes you more comfortable about skin issues. And so please don't say things like "people are going to flip their wings", as we all know that there are bad journalists and racists out there but when you start saying things in the name of an entire profession or in the name of entire other races you are doing even worse.
Regarding xenophobia, Hamilton is British and F1 is a sport where people all and teams over the world succeed. If you take it as a class issue, remember that Hamilton was not a poor kid at all. Putting things as a matter of either it's racism or it's xenophobia is also not nice at all.
And lets all remember that the stewards made the decision. If we are going to investigate any kind of suspicion then we should be looking at them and for the love of God we shouldn't make any generalizations if we do so. Next thing is people talking about racism against German drivers being penalizes whereas others don't. People are going to have to be born on their bare meat the way those things are being treated, as it seems that there is always guilt or self guilt involved in everything. And we will have to date multi-colour, multi-ethnic, multi-religion people to prove we are ok
