It's a very good question -- he was just as responsible as she was, no matter what he claims about a "wardrobe malfunction," and I contacted McDonald's to ask them to remove him as their corporate pitchman. As far as the music industry's concerned, Justin gets a pass because he's one of the top artists out there, with a current hit album, while it seems like Janet hasn't been relevant since Bush 41 was president!
Speaking of Justin Timberlake, black activists were outraged when he was tapped to co-host an ABC Motown tribute special. Timberlake has since pulled out/or been forced out of hosting the show. I can't say I disagree with the activists' complaints.