Not with that attitude..
Alpha Centauri Bb is 4.3 light years from our sun. There is evidence a planet orbits this star, although this has (to my knowledge) not been scientifically confirmed.
Tau Ceti e is approximately 11.9 light years from our sun. A terrestrial (rocky or metallic) thermoplanet planet orbits inside its habitable zone. So your estimate of how long it would take humans (traveling at light speed) is off by a factor of 168.
There are plenty of extra solar planetary systems within just 50 light years from our solar system.
Why? What if they started their journey 20,000 years ago and just reach earth today?
Crazy people can talk about non crazy things and turn them into an insane ideas, sure.
I've seen many crazies make a mockery of many religions. That in its self does nothing to prove or disprove the validity of the concept.
Or bad movies..
Based on what exactly? You did not elaborate why such a idea is "silly nonsense"..
What about all of the other things once thought to be silly or impossible and today are accepted or been proven to be true?
If you are getting your information about the theoretical existence of extra terrestrial life from television, you are starting in the wrong place.
The television show Ancient Aliens is not where we get our hypothesis's about extraterrestrial life...
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