Good post, Marmite. Regarding your point about Corbyn going on Iranian TV (to which I would add his on-record comments praising Palestinian anti-semites) - I think this shows how completely normalised the heavily biased 'Palestinians/Muslims Good /Israel Bad' set of beliefs seems to have become in the further reaches of the Left. Corbyn becoming leader has almost accidentally brought this to national attention.
It was enlightening to read about the influence of Soviet anti-Israel propaganda on the far Left during the Cold War (in the article I linked on the previous page). I had previously been puzzled by why this should have particularly affected the far Left, more than any other elements of the left.
I've been looking again at the comments under one of Jonathan Freedland's articles about antisemitism, in the Guardian. I was really struck by the following comment, a number of pages in, because it was like a breath of fresh air:
"Anti Semitism is utterly loathsome and must be eradicated completely from the Labour Party. As a new member Im horrified to discover that it exists in the Labour Party at all and I may have to reconsider my membership if it turns out to be endemic in the party.... I can feel sympathy for the Palestinian people without endorsing the rocket attacks that they make on Israel in the same way that I sympathise with Israeli families that lose loved ones in such attacks without supporting their heavy handed incursions into Palestinian areas .....neither the Israelis nor the Palestinians are going away and the only solution to their difficulties is one of mutual co existence. Lets not forget either that Israel is a small nation state with its back to the sea and surrounded on all other sides by enemies who are all agreed on the desirability of its destruction..........."
The reason that comment stood out for me was because it was so unusual in its empathetic, balanced approach. In contrast, almost all the other comments from Corbyn supporters focus on: 1) Denying anti-semitism exists on the left; and 2) Talking about how appalling Israel's behaviour (and only Israel's behaviour) is.
There seemed to be no appreciation at all of the complexity and history of the situation, or that there is fault on both sides.