Making contact with an alien species would be the most important event in human history. The fabric of human culture, ranging from the arts to science to religion, would be irrevocably altered. Of course, it hasn’t happened yet and there’s no guarantee that it ever will. But humanity is without a doubt looking. And it may be in our best interest to find them before they find us.

By David Grossman Popular Mechanics 1-19-17

As Wendover Productions posits, with a somewhat militaristic and very un-Star Trek view of the whole endeavor, is that when two civilizations meet, one of them tends to be destroyed, historically. And the one that comes out unscathed, that tends to be the one that made the contact:

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