That there are a few things major chains avoid doesn't invalidate the fact they carry many things opposed to the tastes of most of their customers.

You will find books, magazines, and movies with nudity and sex at Barnes and Noble -- far moreso than allowed under current App Store standards.

Also, to the point of the original app rejection, you will find plenty of material that mocks all sides of the political spectrum. A countdown to Obama's inauguration with a negative caricature of Bush is mild compared to what you can find in bookstores, cable-channels, and theaters.

Those outlets carry such material without their customers getting offended by their mere availability.

Apple will someday (maybe soon, maybe not) allow more and more risque stuff into its store. But it'll never allow hardcore pornography, which most movie theaters don't show, either.