"America was once their country. They sense they are losing it. And they are right."
Pat Buchanan wants for America what Joshua Marshall, M.J. Rosenberg, and every other liberal Zionist wants for Israel.
How to explain the disconnect? I don't know.
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Actually, it's obvious: the reactionary is in relation to the normative, not the objective.
See as always, John Brown.

The leaders of the American revolution were reactionaries in the minds of the British, because to the British revolt was reaction. In fact it was not, but it could have been; that's always the danger. For a revolt to succeed it has to replace one set of normative relations with another. Revolution is never normative and an esthetic of permanent revolution is opposed to the very idea of normative stability. Revolt as reaction becomes self-destruction.

Israel wants to see Palestinian revolt as reaction, and Israeli policy over decades has been designed to that end: support for Hamas against Fatah, the strategic indifference to Yassin, and the expulsion of the pacifist Mubarak Awad. But Hamas is revolt and not reaction, whereas Beck and Buchanan are reaction, simply because they have nothing else to argue from but that.

Zionists, in America at least, could lead normal lives for the same reason Europeans early in the age of Empire could do so: any normative order operates by inclusion and exclusion, and what can be excluded fully can be rendered morally irrelevant. But as outside things move close, becoming neither normative nor fully excluded, when proximity becomes not yet acknowledged intimacy, the mind begins to lose its balance. Sensing the artificiality of moral order and the objective reality of crime, the normative imagination, unwilling to change, twists into perversity. Exclusion and indifference becomes half-conscious rage.

Technocrats are not good diagnosticians.
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addendum: the anxiety of the perverse.