Irrational isolationism is a part of conservative roots? That is news to me and please spare me the “foreign entanglements” admonishment from Washington. He certainly didn’t mind when France got entangled with our quest for independence.
What is "irrational" about not wanting to conduct nation-building exercises? George W. Bush campaigned saying he was against nation-building. Would you also accuse him of being an "irrational isolationist?"