It is not that the 19 are wrong. Its just that so far none of them have produced any evidence of banned substance abuse or rule breaking sufficient to result in a ban. May be more stonger evidence will appear. Goucher certainly seemed to suggest that will be the case.
Farah, however, did have asthma as a kid. I remember articles about him in Athletics weekly when he was in his early teens that mentioned it.
People keep pointing the finger at Farah yet Goucher, Ritz and all the others are clean? Why because Farah is fast? More like because of prejudice. Look how much Ritz and Goucher improved under Salazar. Farah is no more or less likely to be doped by Salazar than any of the others apart from Rupp. Not saying he is clean but saying someone is dirty because you don't like them and others like Ritz are clean because you do is stupid.