Okay, 1: What does that have to do with Alonso vs. Mclaren and stewards,
and 2: What possible reason could the stewards have to "help" McLaren? Your point of view makes absolutely no sense to me.
To be clear, F1 is way more profitable with Hamilton as Champion.
It has to do both with nationality and being the first person catching interest from a new group of people traditionally not interested in F1, due to ethnic origin.
Also very very important with next move to attract again USA market.
Of course they won't make him win, but the favouritism will always exist if you know it's good for the business... Bernie was very clear once saying what would be his ideal champion profile... because for him is not the best driver, is the one who attracts more people and money.
Another example of economical influence in Sports is Petrov at Renault. Now that he's there, Renault has a business agreement with LADA, and even more important the way to a Russian GP is open, because the audiences raised x3 since he's on F1. He was PUT THERE on propose by F1 Management, is not Renault wanted Petrov at all, but renault got some things in exchange, not sporting things though.
For pure sporting reasons Petrov won't be in a Renault this year. Of course he's a good driver, and you have to to be in F1, but that's only part of the equation.
Sounds conspirative?... well, it's business and marketing strategy, let's talk in 10 years and see if you think everything is as transparent as you think now
Cya!.