Responding to an Alien Invasion

2GreenEnergy supporter Cameron Atwood sent me the meme here and notes, I wonder whether an alien invasion would unite the human species.
That’s a heck of a good question.  Let’s assume that, somehow, all of Earth’s people became aware that an alien civilization was coming, aiming to kill everyone on the planet, and that we had, say, at least a few days to respond militarily (or perish).  We’d be expecting our world leaders to yield to the scientific community and adopt whatever strategy they recommended.
In practice, however, there are some serious impediments, one of which is that many of these world leaders are sociopaths.  What would have Donald Trump done had this taken place during his term?  What about Vladimir Putin and Kim Jong-un?
Given all this, it’s really an unanswerable question, IMO.
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