Its a foreign policy doctrine thingy. Buchanan subscribes to an isolationist foreign policy. Likewise with Taki. So if you read The American Conservative or Taki's magazine you will find that viewpoint. They are Paleo-Cons or Paleo-Populists
The other sub-group of Isolationists are the libertarian minded Isolationists like Ron and Rand Paul.
The foreign policy realists, such as James Baker or Brent Scowcroft, are also often called anti-semites. Another of the realists, Henry Kissinger, because he is Jew, is called a self loathing Jew. It was a major campaign issue in 2008 when Kissinger praised Obama's campaign pledge to negotiate with Iran, or Colin Powell, another Realist, backed Obama.
James Baker committed 3 sins against the Zionists: the speech he gave to AIPAC in 1989, he organized the Madrid Conference, and he served as co-chair of the Iraq Study Group. The Iraq Study Group was influential in getting 3 NeoCons fired from the Bush administration: Doug Feith, Paul Wolfowitz, and Rumsfeld. That was made worse by the fact that George Bush first offered Rumsfeld's SecDef job to James Baker, but Baker declined so Bush gave the job to Bob Gates, another Realist, who also served on the Iraq Study Group and had also worked for Jimmy Carter, who was eventually replaced by Leon Panetta, a democrat Realist who also served on the Iraq Study Group, who was replaced by Realist Chuck Hegel, an outspoken supporter of Iraq Study Group.
A couple of other Realists who got in big trouble were John Meareshimer and Steve Walt, for publishing a book entitled "The Israeli Lobby and US Foreign Policy".
A lot of this is the NeoCon republicans wanting to dominate the GOP's foreign policy position by marginalizing the Isolationists and Realists. When Jeb Bush met with James Baker a couple of months ago the NeoCons were outraged. Jeb Bush was trying to say that the NeoCons and Realists would have equal footing in his administration.
There is a similar situation in the democrat party. The Liberal Interventionist democrats(like Shumer and Menendez) tend to be stronger supporters of Israel than the Dem Realists(like Feinstein and Nelson) and the anti war dems.
If you look at foreign policy in broad strokes, under Nixon, Ford, Carter, Reagan, and GHW Bush, the Realists were the dominant foreign policy group. Under Bill Clinton, the Liberal Interventionists rose to power and under George Bush the NeoCons rose to power. Under Obama the Realists have been dominant.
Pat Buchanan wrote for years for Willis Carto’s Spotlight.
Willis Carto and his worldwide operation had no interest in “isolationism.”
His concentration was elsewhere.
However, I don't think it explains Buchanan, whose anti-Israel views are nothing but a by-product of old white guy syndrome. It's inherent in a lot of aging paleocons; the others that come to mind are Joseph Sobran and Charlie Reese.
I used to mash my teeth reading Reese's columns back when he was above ground. Anti-semitism maybe an overreaction for Sobran and Buchanan (but maybe not), however I am absolutely convinced that Charlie Reese was a legitimate old-school anti-semite whose hatred of Jews caused him to cross the line and actually become a supporter of terrorism. I smiled the day he croaked.
Caspar Weinberger (Reagan's Secretary of Defense) was tarred with the same brush. In other words, in some circles, "anti-semite" (or "self-hating Jew") has come to mean anyone and everyone who deviates from the AIPAC line.