The most obvious answer is that it's reported far more in the press than other international issues such as the treatment of the Uighur Muslims or the hostility towards Muslims in India or the genocide against the Yazidi by ISIS. So people are much more aware of it.
Yes there is an element of what is and isn't reported in the Press, that's for sure. But it's not even close to being the full picture, and I agree with the PP who said it "is very thinly disguised antisemitism".
To use the Syrian Civil War as an example. At its height, it actually was very much front and centre in the media not just the press and TV but crucially, it played out in real-time across social media. It's been horrific, with over half a million innocents dead so far. (There was a dreadful strike in Idlib at the weekend killing women and children in a residential area, but I haven't seen mention of it on Mumsnet, despite it being widely reported).
The thing with Syria is, the dogmatic far-left couldn't bring themselves to speak out against Assad's genocide, refused to accept he'd gassed his own people, and for them the enemy was not the Syrian Govt and its allies but weirdly it was....The White Helmets, a unit of Syrian first-responders. It was a literal smear (I know so many on the left love that word) aided by conspiracy theories. And these were pushed by far-left media funded by Russia and Iran - Sputnik, Grayzone, Morning Star - who, surprise surprise, really don't like the Jews! So yes I'm afraid there absolutely is an obsession with Israel/Palestine and consequently Jews, because for far too many of these so-called socialists it's all wrapped up in anti-imperialist, anti-globalist ideology - and who is the greatest bogeyman of that school of thought? The Zionist!! They basically work on the assumption that because Assad (and Putin) are anti-West/Israel and anti-capitalist it therefore aligns with their own anti-imperialist dogma, which is so rigid and entrenched that a large contingent can't seem to acknowledge the rape, mutilation and torture of Israeli women. Because Israel = oppressor.
The reason for this fixation on Israel I keep seeing is 'well unlike dictatorial countries (like Syria) they're a democracy so should know better and this is why we hold them to higher standards'. But this isn't really a reason, it's an excuse. And a convenient one that serves the purpose of a narrative. But I do agree that the West should be exerting more influence on Israel.