You are absolutely correct.
Israel is not the 51st state. The allegiance of any American should be to the USA only. I question the fidelity of any citizen who chooses to retain dual citizenship. Jews are not exempt from this expectation.
The cry of anti-Semitism is sometimes used like the race-card, feminist-card, LGBT-card, etc. Speaking in general, the ADL and others remind me of the Uncle Leo character in Seinfeld, where he sees anti-Semites around every corner.
Yes, there are anti-Semites who hate Jews because they are Jews. There are also people who disagree with Jews because of their positions or questionable fidelity. The latter are not anti-Semites.
The allegiance of any American, and of any human being anywhere and at any time, should be to the One True G-d. Period. No human nation (and yes, this includes the State of Israel) can claim this ultimate loyalty. Anything that attempts to take the place of the One True G-d is an idol, and idolatry is forbidden by the very first commandment to both Jews and non-Jews.
Loyalty to G-d means loyalty to G-d's will in both domestic (the fight against homosexuality and other sins) and foreign (protection of Jews in the Holy Land) policy. There is something extremely sinister when "conservatives" claim that the latter cause somehow undermines the former.
It's also quite depressing--but not surprising--that so many conservatives, even here on FR, see religion as merely an aspect of ethno-culture. Most FReepers defend chrstianity, not as the "one true religion," but merely as something Americans are supposed to practice because "that's what Americans do." Does that mean that Saudis are supposed to be moslems? Indians are supposed to be hindus? Tibetans are supposed to be lamaist b*ddhists???
This exaltation of blood and chromosomes (while hypocritically condemning Jewish nationalism) above Absolute Truth is the essence of "palaeoconservatism"--essentially a form of religious relativism.