The reason Justin was forgiven is because CBS asked Justin and Janet to both attend the GRAMMYs, a week later, and apologize.
Janet refused. Justin did.
It's business. Period.
You don't go onstage and flash your breast at the biggest and most watched family event of the year. MTV had a contract to produce the Super Bowl Half Time Show every 3 years, and because of Janet, they lost it. Clear Channel, CBS & the NFL paid so much money in fines & attorney fees. She played the wrong hand, and wouldn't cooperate when it was all said and done.
Then, had the audacity to follow it up with an album where she was naked on several men's magazines including KING. She was such a dummy.
That Britney/Madonna kiss, 5 months prior, really did a number on her.