Once again watching this latest breaking news story with Israel and Hamas makes your views moot.
Your scenario would have America withdrawing from what happens in the world. so now America just closes its eyes to world trade, the oil markets, just what happens next. Someone will come in and fill the void, you want to watch China, or maybe even Russia dictate the terms that the world must adhere to.
The world, just like America is not just as simple as you want it to be. Even most Americans are never quite as simple as you want them to be. We all have known friends and family who are both conservative and liberal, and everything in between. No one is quite as you describe, I doubt almost anyone marches to the tune of any political party.
At times I have conservative views, and at other times I have liberal views. At other times I am dealing with my own life and couldn't care less about anything. I have that luxury, I can hide away in my office, or just do my projects around the house. But others in this country decided years ago that they have a higher calling. Just like our forefathers, they believe freedom is worthy of the fight, and struggles against people who believe America is just a country that cannot be bothered with whatever happens here and abroad.
Life is never as simple as you think it is, and it will never get easier. It will always be a daily struggle to ensure that everyone in America is free. Maybe that is why so many immigrants still want to come here. America had lots of problems, but when you look around the world, you will always know America will stand with almost anyone else in the world who also wants to be free.