People change. Goldwater became a leftist on this late years, and Buchanan has come to despise our alliance with Israel
Pat has been anti-Israel for decades. We fought a war in 1991 with no American interests at stake for Israel and her Christian dupes, the Amen corner. Christian kids kids dying for Israel. And over 80% approval of the war. Lots of duped Christians. I don't think there's anything new here, Pat is playing to his audience.
BTW, in some circles, circles which would buy into Pat's consipracy, Goldwater's "change" was the result of a Jewish wive, his second, and the influence of his brother, a converted Jew.