Re: Extraterrestrials haven't visited the Earth yet because:

But there is plenty of evidence that aliens already visited earth:

many UFOs have been sighted in the last 3500 years
some ancient buildings have been created by them
they abducted many people (wikipedia rates 11 cases in the last 50 years as notable)
in fact they abducted so many people that smart people buy an insurance against alien abduction
actually, some people are considered to be extraterrestians
there is even an Alien-namespace in CPAN (even if it seems to be misused for mundane modules...)

So the basic assumption of your poll looks wrong to me. Maybe it is just a desinformation-campaign of the Illuminati?! Then we will probably never know...

So long, Rata (resuming his studies of the Principia Discordia in search for the secret tunnels to Atlantis)

Comment on Re: Extraterrestrials haven't visited the Earth yet because:

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Re^2: Extraterrestrials haven't visited the Earth yet because: by Jenda (Abbot) on Sep 04, 2016 at 16:37 UTC
Smart people SELL insurance against alien abduction. Jenda Enoch was right! Enjoy the last years of Rome.	[reply]
Re^3: Extraterrestrials haven't visited the Earth yet because: by Ratazong (Monsignor) on Sep 06, 2016 at 08:47 UTC
Here is a Dilbert on a similar topic.	[reply]
Re^2: Extraterrestrials haven't visited the Earth yet because: by Erez (Priest) on Sep 05, 2016 at 11:06 UTC
there is plenty of evidence that aliens already visited earth XKCD: Settled Principle of Least Astonishment: Any language that doesn’t occasionally surprise the novice will pay for it by continually surprising the expert	[reply]
Re^2: Extraterrestrials haven't visited the Earth yet because: by morgon (Priest) on Sep 01, 2016 at 16:27 UTC
I don't worry too much about the abductions as such but I fear their the anal probes.	[reply]
Re^2: Extraterrestrials haven't visited the Earth yet because: by Anonymous Monk on Sep 01, 2016 at 20:07 UTC
But there is plenty of evidence that aliens already visited earth: many UFOs have been sighted in the last 3500 years :) I believe in UFO, I believe I can see things flying, and I don't know what they are -- that don't mean its aliens, it doesn't follow	[reply]