For Corbyn, the mural thing was the real killer since the mural in question had nothing to do with Israel, but contained blatantly anti-semitic imagery and Corbyn gave it his endorsement.
So I would put it another way and say that it is quite helpful to this conflation you suggest that so many of the people who attack Israel - like Corbyn - also happen to be repulsive anti-semites.
Problem is I would suggest 99% of the population aren't that bothered about it and feel there are more important things to be concerned about (rightly or wrongly)
Northern Monkey ... who can't upload a bleeding Avatar