Well, I can't comment on what Apple allows or does not allow in terms of TV shows and movies, although it's pretty clear that -- for example -- Apple does not allow porn. The fact is that the deluge of Apps is not duplicated anywhere else -- I read somewhere that a new Flappy Bird clone is released every 24s -- I don't think there are as many TV shows to contend with.
The point is that everyone publishing stuff in a store probably has to deal with censorship etc. at some point. Nintendo famously forced LucasArts to remove a puzzle from a game because the solution involved sticking a hamster in a microwave.
So, no, they do not subject anything else to a similar requirement. Volume doesn't give them a pass. The thought process that software developers are less protected than authors is an insulting.
"No Porn" is a requirement they impose on ALL media, so it fair and respectful of the work done by software developers. The thinking that an Harlequin romance novel is somehow more artistic and worthy of protection than something like "Last of Us" is bogus.
Basically TV shows, etc., are regulated externally, so Apple doesn't need to bother as much. Games are open season, and someone has to police standards. I think you're blaming Apple for trying to manage a difficult situation and sometimes making mistakes (which everyone who does similar things also does -- again, see MPAA ratings and ESRB ratings for mainstream games)
The point is that everyone publishing stuff in a store probably has to deal with censorship etc. at some point. Nintendo famously forced LucasArts to remove a puzzle from a game because the solution involved sticking a hamster in a microwave.