Other than it being a bit of a stretch to characterize Ted Cruz as pushing the Fourteen Points, League of Nations, New Deal, and the United Nations organization, I think an isolationist foreign policy deprives the U.S. of the opportunity to reach out and hurt others before they come here and hurt us.
Our retaliation against Al-Qaeda & Taliban didn’t fail; we blasted their winged monkeys to smithareens. It was the highminded idealistic attempts at nation-building which came a cropper and proved so costly to us in blood and treasure.
“Hurt us, and we will come and grievously hurt you & we will then go home and won’t give a d@mn about your precious primitive societies.” - that should have been our post 9-11 strategy & IMO it is what a Cruz administration will pursue.
A philosophy of preventive war will bleed the nation to death. Taken to its logical conclusion we’d end up fighting two thirds of the world. Better to follow the advice of George Washington who said we should keep aloof from foreign strifes.