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i see where you are coming from and i agree with most of it
in 1993, michael andretti went to f1 for mclaren, had a rough time, and lost out before years end to.. mika hakinen. mika was consistently one or so seconds slower in every test they had that year then michael, but he was european, and the sponsors wanted him in, so they used michaels bad lack as an excuse to can him.
michael proved in the 10 years after that in indycar racing in america that he had what it took to be a brilliant driver. recent examples of this include christiano de matta and alex zanardi, both pushed out due to business reasons, both (well not poor alex any more) capable of beating half the drivers in f1 today.
f1 is as much about money and politics as it is racing, dont forget that, it has been since the early 80's when big money came into it. in the world of business sometimes whats best for your wallet is more important then your on track performance.