I'm not defending the people doing it because they should certainly know better, but I'd guess a fair number of them don't understand they're doing something racist either. The Spurs fans using their Yid Army chant doesn't help either. It confuses an issue that should be straightforward as a 'no-one should be doing this shit' thing.
http://www.telegraph.co.uk/sport/fo...White-Hart-Lane-says-Metropolitan-Police.html
With all due respect, that is rubbish.
Perhaps those fans do not know know exactly what they're chanting, it's a real possibility. I'd tend to give Chelsea (and West ham) fans less of the benefit of the doubt than I would a Stoke fan for example , considering those two fanbases are the only two that still occasionally send anti semitic abuse our way (and by anti semitic abuse, I don't just mean singing yid out of context either).
It is of course also disingenuous to equate this with Tottenham fans singing yid and strikes me as (a much milder) form of the same argument about why it's OK for African Americans to say nigger if they get offended by white people saying it.
It goes without saying there is a historical reason (whether you agree with the use of the term now or not) for Spurs fans to associate with the term yid. To cut a long story short, it was historically a word used pejoratively by fans of other clubs based on the assumption that our fanbase was more heavily Jewish than others. To remove the sting from this insult, the fanbase turned it around and took on the term as a source of pride, removing a lot of the viciousness of the term. Bit by bit, other fan bases have stopped using the term, excluding one or two. That is partly down to the changing of football culture in the country as a whole anyway but also partly down to the claiming of that term to be a source of pride.
Having talked to quite a few Jewish spurs fans (and randomly a couple of non spurs Israelis), not a single one of them found the term in this context offensive. On the contrary, they had a sense of pride that the club and its fans had long associated with the local Jewish community. Though I acknowledge that I cannot possibly articulate the general opinion of London or the world's Jewish community.
I'd assume it's also rather clear that the underlying meaning and intent when used by Spurs fan is altogether different compared to when used by Chelsea fans.
Anyway, back on topic. Chelsea looking good since the opening day debacle (where I reckon they probably would have walked away with 3 points anyway had it not been for Fabregas' stupidity) and Morata seems to have settled in very quickly too.