Sounds similar to the guy that thinks spaceflight is impossible and all satellite signals come from a fleet of helicopters hovering around the world.
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land for thousands of years. You've never been visited by outsiders, thus you believe besides yourselfs there are no others
anywhere in the world... this is it.
Then, one day, some crackpot runs out of the bushes screaming that he saw some white humanoids who landed on a
huge strange object, and some half human-half beast gods are coming this way. RUN!
Ok, he is a nut. No one runs away. Ifcourse, the white man did come. And he conquered, and converted the natives to
worship his gods.
Now, I have to ask, if aliens did visit planet Earth, why have humans not been conquered, made slaves, converted
to alien religions, no alien settlements, no colonies, no army bases, no alien tourists, etc.? Aliens have never visited
planet Earth. If any alien species is 10million, or even 100,000 years ahead of humans, they should be able to fly
across the galaxy. Ifcourse, if only primates are capable of evolving intelligence and technology, then we are in for
a real long wait.
Main argument is that 1 is the most unlikely number of times something occurs, if life can start once it can start more than once and given the amount of time and space available it would have to be an extremely unlikely event to happen only once.
I don't believe we've been visited by anyone though, mainly because of the travel distance involved.
Reductionist and proud of it.
Being ignorant is not so much a shame, as being unwilling to learn. Benjamin Franklin
Chase after the truth like all hell and you'll free yourself, even though you never touch its coat tails. Clarence Darrow
A person who won't read has no advantage over one who can't read. Mark Twain
We have also the lil problem with time. It is not only that it must happen in our neighbourhood it must also happen roughly at the same time. From time of dinousarus to now whole civilizations in space around us could arise and go poof without trace.
And also the other problem with similarity. If we step an alien on his "foot" would we even recognize the encounter?
An alien civilization in our neighbourhood and existing at the same timeframe would also need to be carbon based and look roughly what we consider some form manageable living form - or we would miss it as some other phenomenom and all our discussion would be as fruitful as with a flu virus.