I disagree, there was a time during Bush's presidency where to criticize or question Bush's policy was equated to being an unpatriotic traitor. I'm pretty sure the Dixie Chicks experienced a lot of the vitriol, public shunning and public crucifixion you don't seem to remember anymore.
You don't remember or refused to understand what happened. The Dixie chicks were shunned BY THEIR CUSTOMERS because their customers held different views of the current situation. Never ONCE were the DixChicks dragged before the media and skewered, in fact the were regarded as something 'super.' (why I have no idea..) They were reckless and moronic to say/do the things they did given their medium. I'm glad that it destroyed their career. Stars need to figure out that they shouldn't express their opinions, its not what people want to see or hear.
I have a theory that it's impossible to prove anything, but I can't prove it.