In a world where superheroes did that kind of thing, the norms and forms of civilization in general—not just foreign relations—would change dramatically. Slowly or quickly, the logic of such interventions leads one's superhero into the world of Moore's Miracle Man.
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Yes, this is also an issue. There was a very brief run on Cable by a guy named David Tischman that was all about averting Reed Richards Is Useless by having him intervene in real wars (Sort of; fantastic twists were put on the stories, like him trying to stop two factions in The Balkan Wars from obtaining a super-plague and a clone army respectively)... and it was dreadful. The number of sympathetic characters was literally countable on one hand (which may have been Tischman going for a War Is Hell moral or just him being a sucky writer), plot points frequently led nowhere, the art sucked, and occasionally the plot just... stopped to allow Cable or the narrator to lecture the reader on Tischman's views on international politics.

The way I see it - the current events stuff is great to explore in the indies and in alternate universes, but standard superhero fare should stay the hell out of it. Ex Machina and Watchmen are great, but they work better as exceptions and not the rule.