I'm not implying that the reason behind the original comment was solely for publicities sake. Rather, I'm pointing out that in the film, their manager suggests getting people to burn CDs and organize boycotts against them, because it would bring them so much press. Their publicist expresses her concerns over their posing for the EW cover, and they comment about how they'd never get such attention if it was not for "the comment". And in the biggest example of all, the film was presented as a documentary about free speech when the truth is that it's as much about free speech as "Abba: The Movie" is a documentary promoting Australian travell. It is a movie that was brillantly put together to market their latest album, and tell the story of the creation of the songs on their album.
I agree with you 100% on the presence of politics in music. But I don't think that means that every time that music and politics mix, the motivation is politics. I don't think that artists and performers deserve a free pass to be listened to always when they speak up on political matters. When they're doing so to promote themselves (example: An actress who is suddenly moved to go visit orphans in Mexico right at the same time her new big film is coming out, but a year later seems to have forgotten that there are orphans in Mexico) I applaud those who greet the action with cynicism.