With more than a million Muslims here, many of whom would like to forcibly impose Islam on us, and 15-or-so million Hispanic immigrants, it's a bit late for isolationism. We imported trouble and now we have to fight the root causes of it.
If we had truly remained isolationist and had retreated to our side of the planet after World War II, Communism would have taken over much of the world. We would be entirely outnumbered and surrounded by Communist aggressor nations, people who were as hypnotized by their ideology as the Islamists are by theirs, and almost as determined to install it here.
"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." -Manuel II Paleologus
As the saying goes, fools rush in where angels fear to tread. I think there are people with more perspective and sanguinity who do not see losing 15 seats in a legislature of 535 as a big deal. Then there are the chattering classes whose jaws have come unwired and seem to be flappping their gums to any and every tune this week. New direction will come from the national conversation engendered by the presidential election, not from post election cruises of pundits.