Because they are rational human beings and not david icke like conspiracy theorists who come up with totally ridiculous ideas like that cyclists may dope.
Or at least, if you want your posting exchanges with this poster to be anything more than pixels on a screen, thats the kind of intellectual level you will have to stoop down to.
Actually I do think hog and blackat at the very least would go down as anti sky diehards and a few others as well.
Not that there is anything shameful about being anti sky given some of the disgraceful behaviour Wiggins and Bailsford have demonstrated. Bailsford using Txemas death as an explanation for hiring Lienders. Wiggins tearing Floyd like a Piniata even though he knew Floyd was telling the truth

Bailsford saying he is shocked to find out lance was doping and hadno idea Barry and the like were dopers

Wiggins casting doubt on Sastres win and on anyone who won the TDF then saying that people who do that to him are ****ers totally beneath him. Bailsford saying not to worry he will soon explain the Lienders situation then playing PR for the next 6 months and doing jack ****.
Etc.
These are not unproven allegations either dreamt up by sky haters but a matter of record.
Just because one finds such behaviour repulsive though and as a result comes to dislike sky does not make one biased against them or incapable of rational thought and argument.