Yes, because their first America-dwelling ancestors were either Bundists or Socialists (the REAL McCoy ones) from Europe or they were originally observant, but threw their religion out with the garbage in an effort to become more “American” and less a separate group, because of a cultural memory of the horrific anti-semitic brutality of much of the Europe they fled. They figured, don’t be different, be as totally non-differentiated “American” as you possibly can, so that you will not be singled out again for persecution. They stopped observing holidays (also because there was no such thing as not working Saturdays), stopped eating kosher food, stopped dressing differently. Their offspring, the offspring of that offspring and finally the latest generation picked up on this discarding of Jewish ways. With the discarding of Jewish observances came a natural failure to have a reverence for Israel which is an important part of authentic Jewish identity. Thus, you have the current leftwing liberal “Jews” who may not, according to Jewish law, actually be Jewish due to intermarriage, and who lack a cultural identity, including a devotion to Israel. Their natural Jewish empathy has been co-opted to serve groups other than Jews, such as blacks, etc. It is therefore little wonder that these latter-day Jews or half-Jews have little to no identity with Israel or see its importance.
At least this is what I understand.