I don't know if I would say they should be grateful, but I'm sure there are other dancers who would've been. Again: if it goes against your morals and is something you don't agree with, yet you do it anyways to further your career, you're certainly in no position to feel sorry for yourself. You did what you did to get ahead.
SuperMillionaire--the thing you don't seem to be acknowledging is that it doesn't matter if Miley Cyrus' current actions 'smear' the Disney or Hannah Montana brand. She's no longer affiliated with or in contract with Disney, therefore any sort of behaviors she exhibits has nothing to do with Disney's image. If it does reflect negatively on them, it's stupid to blame her, as she's no longer an employee. If she was still contracted with them, then I could see why people we be upset on her behavior impacting children or the brand negatively.
And again: if you don't think she's a good role model, then you as the parent on responsible for the media your child consumes.