The relevance of Israel in a thread is really only about (a)whether it can be appropriate to accuse people of antisemitism on the basis of their being critical of actions and policies of the Israeli government? Or (b)on the basis that they challenge the legitimacy of the state of Israel?

And (c) whether it is the case that accusations of antisemitism are being made against members of the Labour party.d

Strictly speaking, arguments about Israeli and Palestinian history, or about the justice of the two sides, are not really relevant.