You don't think that isolationism was what led to both of our world wars?
No. Germany was hardly the villain in the First World War, really not much better or worse than Imperial Britain and France. Had the US not intervened, the war may have ended in stalemate, hence no Hitler, no spread of Bolshevism to Eastern Europe, and no dead Americans.
Had the US not intervened in World War Two, there might have been another stalemate (Hitler was stopped in the west at the Battle of Britain, and in the east at Stalingrad, so it's not like the US was all that stood in the path of German world conquest). Naziism and Communism would then have sapped each other, both collapsing over time, perhaps a lot sooner than 1991. And no dead Americans.
The wise more for America is to husband its strength and allow foreign tyrants to destroy each other.
No, isolation does not create foreign wars. It's US intervention that stirs the pot of others' wars, and makes things worse.