I present this without comment so that you may draw your own conclusions. From the Huffington Post:
Staying consistent with the conviction to always do what they want and write music for themselves above all else, when 21st Century Breakdown was released three years ago, Green Day caused a firestorm of debate, because they refused to sell their music in Walmart, opposed to the powerhouse retailer's insistence that they censor the music so it would be more family-friendly. Speaking out in interviews and on talk shows about the Walmart debate at the time, the band replied, "There's nothing dirty about our record.... They want artists to censor their records in order to be carried in there. We just said no. We've never done it before. You feel like you're in 1953 or something."
Fast-forward to today, amid the promotional roll-out of Green Day's latest risky venture, the album trilogyiUno! iDos! iTre!, and you get a complete change of heart toward Walmart, censorship, and apparently the 1950s in general. While it can be argued that this time, at least, the album trilogy can be considered (ahem) dirty, it seems that they now feel that American Idiot and anything else from their back catalogue is now fair game for censorship, as well. In a particularly ironic Orwellian twist, "clean" is the new word for censorship. Clean albums. Clean videos. Clean songs. I kid you not.