Most Jews, statistically, grew up in the United States, like I did, grew up with other Jews, whether religious or not. We didn't feel all that isolated.
Considering that Jews are maybe 2.2% of the American population means that most Americans will never actually meet a Jew. According to my quick count (on the chart you can access by clicking here) thirty-two 32 out of the fifty states have less than one percent Jews. Even California has only 3.3%, and the surrounding states have even less.
Because so many Jews live near other Jews, they don't realize that the antipathy so many Americans (and ordinary people all over the world) feel towards anything Jewish and Israeli have nothing to do with us or anything a Jew ever did to them. That's because they've never knowingly for sure met any Jews.
They don't know much history either, not American, World or the Middle-East. That's why the Left has such fertile ground to work with on their anti-Israel campaigns.
We have a very, very, very long hard campaign ahead.