You’d be surprised how many Jews don’t support Israel.
It goes back to before WWII, where the Jews in Europe, especially in Poland, were divided between Zionists, who wanted to establish a Jewish homeland, and the members of the Jewish Socialist Bund, who abhorred the idea, because they felt having all Jews move to Israel would detract from their goal of a worldwide socialist revolution.
There have always been Jews who have never been Zionists or support the state of Israel. On the far “right” there were Orthodox communities that believed that devout Jewish communities that adhered to the Law were “Israel” wherever they may be and argued that devotion should be to G-d and not a physical place. Secular socialist Jews, many overtly atheist but Jews by birth and culture, categorically rejected Israel before and even after the Holocaust. Many if not most German Jews prior to WW I confronted with the migration of their co religionists fleeing persecution and seeking solace in Germany historically were not sympathetic to these migrants or Zionism. However all of these Jews, if they survived, never denied the Holocaust and all were affected by it. Also it can be argued that the minority Jews who do not “support” Israel, down deep in their hearts take pride and are relieved that Israel, the modern state, has come to be, prospers and continues to exist.