Of course you can change your mind or be wrong. But we have previously been told - by JV - that JV gave Wiggins the lowdown on Armstrong back when Twiggy was riding for him.
Wiggins then spent a couple of years overtly sucking up to Armstrong and doing things like attacking Floyd Landis when he spoke out. Wiggins then said, when the Reasoned Decision came about, that he had suspected Armstrong back in 2009 and that he was upset and angered by the whole thing.
So, somebody's lying. Somebody has to be, because the stories aren't compatible. If Wiggins had indeed been told about Armstrong's doping by JV, then he didn't need to come to his own conclusions. Even if he did come to his own conclusions, why did he need to spend the next two years expressly praising Armstrong and being on the record saying things like "I love him"? Is that not a highly dubious standpoint to take for a professional athlete on a fellow professional athlete that they either know is doping or highly suspect is doping?
However, the only way to spin it where Wiggins isn't being disingenuous and coming across as being pro-a guy he knows is doping, is that Wiggins genuinely did not suspect Armstrong and the Reasoned Decision came as a genuine shock to him. This would then render both him AND JV liars, because Vaughters would have not told Wiggins about Armstrong in 2009, then claimed he did, and Wiggins would have revised his timetable of beliefs on Armstrong to make himself look less naïve and foolish, inadvertently heaping undeserved suspicion on his in-good-faith comments of 2010-11.
And the fact of the matter is, there are so many lies and half-truths in Brailsford and Wiggins' public statements that it makes it harder to believe in them when they are telling the truth. That's just human nature.