This sensible proposal to update WP:NPOV is in response to Fastfission's excellent comments (I recommend reading them in their entirety):
As just one clarification... when I suggest we need to spell out our neutrality explicitly, I don't mean it to sound like I am assuming a dumb audience. That's not true at all. But if the "neutrality" comes from someone having to have a meta-view of the image -- "Oh, what an interesting image. When I look at it, I see it as anti-Semitism, but others would say it is only anti-Zionism. How clever." -- I don't think that's neutral. For one thing, the ambiguity of the image -- the entire claim for it being a good illustration up there -- is exactly one of the reasons that such ambiguity needs to be outlined explicitly (if we know someone is likely to interpret only one POV in the image, we need to point out that we don't mean for there to be only one POV in the image).
A less-charged analogy would be using the picture of the famous Duck-Rabbit illusion (http://commons.wikimedia.org/wiki/Image:Duck-Rabbit_illusion.jpg) to illustrate the article on "Rabbit", with a caption saying, "A famous picture of a rabbit." Now, one could argue that the point of using the image would be to show the reader that a picture of rabbit could also look like a duck, but by not spelling that out explicitly, and using it at the top of an article called "Rabbit," I think we are easily sending the message that the illustration is of a Rabbit. Whether or not we are worried about prejudicing the reader -- who cares, in this case -- the real problem is that it looks like Wikipedia is taking a stance on the issue. Now, if we changed to caption to, "In the famous duck-rabbit illustration, one can see a duck or a rabbit," then it is made perfectly clear. It isn't dumbing it down at all, it is just making explicit the point of putting the image in the article, and making it clear that Wikipedia itself is not taking a position on the issue. It is also a better caption, if that is what the image is meant to represent. "A picture of a rabbit," is actually NOT descriptive of the image, if it is being used to illustrate conceptual ambiguity.
If it isn't obvious to numerous editors that something is neutral -- and I think it is clear from the dispute that it is not obvious in the case of the new anti-Semitism image -- then it is probably safe to assume that it is NOT neutral. In this case I think a slight tweaking of the caption would fix it perfectly and bring it into line with our stated goal of neutrality, without stepping on anyone's toes.
FF
-Scott