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It's probably just the disconnect between the two sides of american politics. On the right it's justified enough, on the left it doesn't matter what Trump says, the reaction is going to be exactly the same. For example I'm not american and mostly on the right, and I think it's doubtful if it's legally justified (how does one legally justify a was anyways? it's extra-judicial almost by definition), but it makes a lot of sense, it aligns with realpolitik and it's morally good for several independent reasons. In particular it has a hugely disproportionate geopolitical impact, and less importantly it can bring a few million people from under a dictatorship. As an interesting aside, I recently did a quick research on the Grenada invasion, widely spoken of as an embarrassing moment. It went... very well. They came, remove a budding dictatorship right after a coup, left in two months, and Grenada had no ill effects in the years after (both by subjective reporting, and by GDP per capita comparable to neighboring countries). The alternative would have been "do nothing", skip the reputational hit and have yet another hellhole in the region. The number of dictatorships that did well in recent history is exactly two, and neither was socialist (SK and Singapore). |
I see we’re now living in a world where many people genuinely don’t even remember the answer to this question.
Roughly, you can legally justify a war if (i) it’s in self defense or (ii) you get a UN Security Council resolution. That’s why GWB tried to get a security council resolution before going into Iraq, as the case for self defense was pretty shaky.
Is it common for actual wars to meet these legal requirements? No. But that’s just because wars are something that generally shouldn’t happen. It’s also not common for murders to meet the requirements on justifiable homicide.
Some of the discussion of the legality of the US invasion of Panama is relevant here: https://en.wikipedia.org/wiki/United_States_invasion_of_Pana...