I'm not a great fan of Buchanan, either, though I think he is a worthy (and amusing) foil to the self-satisfied, consumer-tested, Beltway-approved "conservatism" of the Republican establishment.
As for isolationsim, I'm beginning to think that George Washington really was our greatest president and that his advice could have prevented a great many troubles. Why do we need to become so entangled in other peoples' tribal wars? I'll take isolationism over Wilsonian triumphalism any day.
We have had war declared on us. We are cleaning up a mess we left after 91...hopefully we will show a relatively just nation can exist in the ME.
We cannot hide here and ignore it. I have spoken more broadly to this in previous posts on this thread.
That said, Buchanan has a shtick to maintain and a specific seat to occupy in the pantheon of Beltway pundits, and that's how he earns his living. Nobody will pay him to produce milquetoast. When I see him occasionally on Mc Laugh-In Hour I get the impression he thinks it's all a joke...
"Great minds discuss ideas, average minds discuss events, small minds discuss people." -- (attributed to) Admiral Hyman G. Rickover