Your last sentence hits the nail on the head.

And without wanting to get all philosophical at this time of night on Good Friday, having been celebrating (two days prematurely) the rising of the Lord with a goodly amount of Lidl's finest Primitivo, here's my take on that bloody mural for what it's worth. I have to imagine myself casually walking past it in 2012. I think it's an ugly and unattractive thing. I struggle to understand the imagery beyond the depiction of rich men making even more money on the backs of poor people. Any hint of antisemitism utterly eludes me until someone points out that several of the blokes have, er, hooked noses. I wonder whether the artist, had he meant to portray his antisemitism, could have been just little more explicit about it. Now my antennae been tuned to racism for decades. So I do wonder how Joe Average might have regarded the mural. What I really think about the people who claim to see "rampant antisemitism" where there is none is that they're victims of their own stereotyping of Jews. In other words, they may be closet antisemites...