Re you Canada/Russia analogy
Iraq already has the oil resources. They are on their soil. They are not conquering anyone to get them, they already own them, do they not?
I’m not seeing why they are “ours” ... either the US or as you said “the world’s” resources.
The issues are (1) they have openly declared their intent to conquer the world, starting with the Arab world and (2) they are part of the Islamist movement that toppled the Twin Towers on 9/11. By your logic, German and Russians are Europeans. How is it the business of anyone in the Americas if the Germans or the Russians conquered all of Europe? How was it our business if Japan conquered all of Asia? The issue, ultimately, is what the military can do to defuse threats before they become dangerous enough to kill large numbers of Americans.