you don't represent the interests of the British left wing by capitulating to the British right wing or letting Zionists direct a purge of your party.
Funnily enough, that is beginning to sound like antisemitic conspiracy theory - those devious Jews, orchestrating a purge of the Labour Party!
Labour was under attack by the Tories and their pet press: they drove it, not "Zionists" (although I accept there can be significant overlap between the two). The simplest way to restore the reputation of the party was a clear and strong response against antisemitism - which, sure, "Zionists" could piggy-back on. The later purge has little to do with Jews or Israel at all, but that Corbyn and much of his clique were absolutely fucking toxic to Labour's electoral chances.
And let's not forget, Jeremy Corbyn (who of course referred to Hamas and Hezbollah as "friends" as the style was in his clique), recently went on TV and repeatedly refused to say that Hamas was a terrorist group even after they'd recently murdered ~1000 civilians in cold blood. It's very nice that he later admitted that they were a terrorist group in a written piece, and stated he thought the IDF could be accused of terror too (fair enough in my view), but that TV gaffe is precisely this sort of clod-hopping inadequacy that made him an utter fucking liability and helped hand your "Zionists" the openest goal in the world.
I cannot help but wonder - if a more practical and savvy leftist like John McDonnell had got the nod rather than Corbyn, I think things could have been very different. Instead we got the modern equivalent of a holy fool, which the zealots refuse to acknowledge for what he was.