The key section should be "Wikimedia Commons is a common central media repository of all Wikimedia projects":
"[...] files uploaded to the Commons have to be useful for some Wikimedia project. Media files that are not useful for any Wikimedia project are beyond the scope of Wikimedia Commons."
How could Commons be any more specific than that and still fill its "service" role?
That kind of statement causes Commons to inherent the combined acceptability guidelines of the other projects. I can't think of any project that would allow such images as these, not even as acceptable demonstrations of how other cartoons could be developed.
Commons has an implicit NPOV policy because all other projects have NPOV policies. That might be something worth putting into writing.
--Andrew Whitworth