To me a poor start is not a mistake, specially when one of the guys that overtakes you is in a car with KERS, also not being able to overtake Massa isnt exactly an error. So to me, your analysis of Bahrain and Spain doesnt mean much. Then there is also Turkey, it is a fair call, i admit, he did run wide after all, but on the other hand I dont think that was 'The' decisive factor that cost him the 2nd place.I think you actually misread. I counted only races with real errors like slow starts, crashes or getting off the track, I didn't count being outpaced by Webber, I didn't count races like Brazil where I felt it was more teams error / lack of luck. Only pure errors. Fact is - Vettel had 7 of those races. I'm asking again, how many of those did Button have?
I think you can find some examples of button losing positions at start as well but tbh i have no reason to go after button so i won't bother, as i said he was the driver of the season for me.