There’s quite a divide between Israeli Jews and American Jews.
In America, “you can be liberal without being Jewish, but you can’t be Jewish without being liberal”. Most American Jews regard the Palis as innocent victims of the IDF & the hated Netanyahu.
Unlike in America, Jews in Israel see the murderous enemy up close & personal, making for a more realistic outlook on the true nature of the Muslim-dominated Middle East.
You are overestimating the percentage of American Jews who think that way by using the word MOST. Some left radicals think that way, but only a minority of the whole American Jewish population.
In general, American Jews' opinions on Israel and the Middle East are influenced most strongly by one most important factor: Those who have visited Israel are much more likely to support her than those who haven't.