I think there's a glaringly obvious reason that I've never seen a single person mention, which is that Yemen, Syria, and Sudan aren't U.S. allies.

And because Israel is a U.S. ally, citizens of the U.S. feel more responsible for what's happening there, and therefore also more justified, entitled, and empowered to demand change.

Whereas with respect to the other conflicts, it would feel more like "meddling".

That doesn’t mean antisemitism has does not play a role. But it does mean that it’s an illogical jump to claim that antisemitism is the main factor, since there is another, probably simpler explanation.