Well, is there a practical difference between being isolationist by deliberate choice, and isolationist because of the impact of other choices?
I mean that I prefer the top of a mountain to the boroughs of Man, most all the time.
As for actual isolationism, Conservatism has a strain of it, or what is often taken as isolationism in the 'Foreign entanglements' clause by Washington... A thing readily embraced by libertarian minded people.
But it is more from the other direction - It ain't none of our business - Which is a very important rural principle... Mind your business. Makes for good neighbors. So I get that.
Personally, I observe the avoidance of foreign entanglements. Almost always. I am nearly never *for* war.
But, if we are in, then get in with all four feet. I'll have your back.
That's a fair example of my 'isolationism'.