Apple can and should vet apps for HIG compliance, not crashing, and taking proper advantage of the platform (i.e., not emulated). That makes for a quality user experience. Agreed.
What Apple should *not* do is vet apps for content--whether it's farts, news, poetry, knitting, political, or porn. (unless, of course, it's illegal).
Would Apple have rejected Jesus' or Mohammed's or Moses' or Martin Luther
King's teachings in their time because they were unpopular? Would...