It seems to me that those who can't see what is bothersome about Friggins and company are just like those who couldn't see what was bothersome about Lance and company.
I think part of what happens is that so many professional athletes in so many different sports are on such complete doping/drugging regimens that many spectators have lost perspective on what natural performance profiles look like. There are so many cases in so many venues of stars who appear to come out of nowhere, and the media so cultivates their stories, that such things come to seem normal, and even though occasionally some of them may have something to them, most of them don't.
In sports like cycling or track and field so many of the recent (last three decades) champions (all?) have tested positive or admitted doping that it seems unlikely that the current champions are not doing the same. One wants to hope that Usain Bolt is just something special, and at least in his case his talent was evident when he was a teenager - but almost all the guys he is beating - Gay, Blake, Gatlin, etc. - have actually been caught already, and this ought to generate skepticism in even the most uncynical observer. In cycling even one of the most naturally talented cyclists in recent memory - Contador - was doping in order to win the big tours (I say it so confidently not because I am some clinic hater who wants it to be so, but because he was caught) - and so it is reasonable to question riders like Froome and Wiggins whose history does not indicate talent at the Contador level, but whose current dominance is reminiscent of Lance Armstrong.
Of course there are still those who believe Armstrong never tested positive, but this is really willful blindness to a mountain of evidence, some of it direct, some of it circumstantial.
Why some of us care - to read Wiggins's jingoistic "I don't dope because I'm British" piece in the Guardian made me very tired - I'd like to believe that someone who takes such a self-righteously bigotted attitude would never dope, but after having watched pro sports for decades, I doubt very much that it is so.