Because maybe I would like to watch the Super Bowl with my kids without having to worry about it turning into an R-rated filth-fest.
I personally wish that every last member of the Jackon family would move to Mars and never come back. Janet is repulsive and overrated.
That being said, all of this stupidity could easily be avoided if the idiots in the NFL would allow college marching bands to perform at half time, as they used to do years ago.