In the ST universe somehow humanity gets over the shock of aliens and does not try to bbq the Vulcans. In a real world situation we would shoot on sight and instead of treating brown people like dirt, we would treat green people like dirt instead. There would be no Terrancentric Federation, other advanced worlds would not want us in it. Reminds me of a ST Myriad universe novel lolAnd you don't think "Terra Prime" won't happen if real aliens show up. That will be the very first thing that happens, or one of them. We'll drop conventional racism and do that instead.
Human nature is at best screwed up some of the time.
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