So... rather than just cursing/condemning all Zionists, why do Ansarallah/"Houthis" curse/condemn all Jews instead?

even they would believe Jews had a greater claim to persecution than if the US military were to show up and started doing genocide purportedly because Jesus needs Christians in control of the Holy Land.

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That is not the comparison I am making. The point I am trying to make is that a religion that does not welcome you as a believer is going to be more concerning to a person than a religion that does. A Houthi cannot become a Jew (for the most part). A Palestinian Muslim, even if their ancestors were Jewish 1000 years ago cannot become a Jew again (at least according to the way Israel has been conducting itself). And for those reason, it makes sense that Judaism itself is viewed with concern by the Houthis.

edit: To further explain this point at least how I imagine most people in the region would at least think about. When Islam came to that land, they converted the local community to Islam. But when these new people come in, they want to kill everyone? Why don't they just convert the locals again? For most people, the explanation would be Judaism as a religion.