I don't know what's scarier to humanity, the fact that we're alone in this vast universe or the fact that there are aliens.
I also prefer to think that FTL Technology is impossible and caused alien civilizations to be spread out across the universe. Waiting millennials to ever encounter each other. Not to mention that the light from other alien civilizations might take forever to ever reach for us to find out if life does exist unless we do decide to go there.