Illegal? To have something be illegal, means there are a set of laws and a body to enforce them. There is no supernational government. There is the UN, a loose confederation of nations to provide a platform to discuss and solve issues on a volunteer basis. This is why it tolerates the existence of authoritarian and autocratic governments as members and why powerful nations even bother with it at all.
Maybe you wish there was a democratic global government, but that isn't the world we exist it and it will not be a world we live in any time soon.
Game of Thrones has a nice metaphor of "summer born", people like you and me who have been born in a time of peace and prosperity - an outlier period in human history - but who think this is the default state of the world.
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One more point ... Do you disagree that the American 'Empire' has been the most prosperous and peaceful in human history? If so, which one was better?
American wars are illegal even by American law standards.
There is no declaration of war that makes what America is doing in Niger legal, by American legal standards. There certainly isn't any legal cover for America's illegal occupation of Syria. Not to mention, support for genocide in Yemen is absolutely illegal.
Its just that the people remain ignorant of this fact - and its politicians - choose not to enforce those laws for their own purposes (war profit, intolerance, hatred, etc.)
Maybe you wish there was a democratic global government, but that isn't the world we exist it and it will not be a world we live in any time soon.
Game of Thrones has a nice metaphor of "summer born", people like you and me who have been born in a time of peace and prosperity - an outlier period in human history - but who think this is the default state of the world.
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One more point ... Do you disagree that the American 'Empire' has been the most prosperous and peaceful in human history? If so, which one was better?