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I think it has more to do with panache. I saw a tweet wishing Pantani and Contador were still racing, that even though they were dopers they were entertaining, and scores of the anti-Sky twatterati agreeing. Froome is as ugly as all sin on the bike, Sky train it up the mountains, it doesn't make for great viewing. I mean no-one really asks questions of Sagan despite being a ridiculously dominant rider, super-human really. Quickstep are ferociously successful, no real questions asked if them. Alaphillipe went from puncheur to grimpeur and won KOM, no questions.
Why? Because the fans like then and like the way they ride so they get a pass. It is noticeable that a lot of the polemics have died down since Froome dropped out of contention since Thomas is more popular, acceptable rider from a small town in a small country, popular in the peloton and known as a strong, attacking rider. Had Froome won this would all be a lot worse.
Not being jingoistic, but if the dominant team was French sponsored, with a French leader, would this soul searching be going on?