Far too many people, especially Germans, have a pronounced tendency to pessimism. The “German Angst” is world-famous, and the list of things we fear is long. Currently in fear fashion are World War III, climate change tipping points - and aliens, due to recent balloon sightings.
But before anyone gets stuck on a planetarium, it should be said: If extraterrestrials actually land with us, they would be extremely highly developed. Otherwise they would not be able to travel the vastness of space, which is not only technically extremely challenging.
They would have left base instincts such as greed and hunger for power long ago behind. Expect explorers, not conquest warriors. But even if aliens came to us with unfriendly intentions, as in the film "Independence Day", it would still have a good thing: Mankind should finally pull itself together, fight together instead of against each other. So: Let's be optimistic!
The author saw "E.T." in 1982 in the Royal Palace cinema in Berlin and cried at the end of the film.
The speculation that the tic-tac-shaped UFOs that have been shot down in large numbers are extraterrestrials are, of course, nonsense. The best argument for this is that they would certainly not fly light years through space and then be shot down by paltry F-16 jets.
But if aliens did come one day, it would be a dark day for humanity. Indigenous peoples are technically superior explorers and, in their wake, conquistadors have never been well off. This applies from the Huns to the Vikings to the Spaniards in South America and the English in Australia.
Why should it be any different on the interstellar scale? The Chinese science fiction author Liu Cixin elaborates the most compelling idea in his "Trisolaris" novels. The universe is therefore a dark forest. Anyone who draws attention to themselves is immediately massacred, out of the understandable fear of the aggressors that they would otherwise suffer the same fate in reverse. Caution is also the mother of the cosmic porcelain box.
The author believes that aliens would not come here anyway. We're too insignificant for that.