Weak. You failed my litmus test.
Darn.
You have brought something up that appears to be endemic particularly in the USA where even the president is affected, and that is disregard for the truth regardless of the evidence.
On this forum the following beliefs are pretty mainstream though different flat-tards will subscribe to various belief mixtures:
The earth is flat
The sun is only 34 miles in diameters and 3000 miles from the earth
The earth is covered by a Dome
The earth has an ice wall
Antartica is off limits
There are undiscovered continents on an infinite plane connected at Antartica.
There is a black sun and moon
Gravity does not exist
The earth is surrounded by aether
Satelites do not exist
Spaceflight is a hoax
NASA is up to all kinds of dubious activities
Global warming is fake
Moonlight is dangerous and precautions need to be taken at night
Sunlight is beneficial and the sun should be looked at for long periods.
Every image taken from space is a product of CGI
The fossil record is a hoax and all the fossils in the world have been made in China
Perpetual motion machines are real
All history up to 1600 approx has been faked
Penguins are not natural and are a result of a genetic experiment
The list goes on as there are many things I have missed.
The question is why would any sane person wish to believe in any of the above as there is no evidence to support any of them? That's the real mystery.
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The reason is actually disturbingly simple. Self-validation and self-image. People need to believe in themselves and to think well about who they are. Most people do this reasonably well, but some have very poor education, a relatively low intelligence and low social interaction skills. They should (and do) feel bad about themselves and seek to improve that self-image. There are a good number of ways to do this of course, but one way is to fabricate a delusional self-image that you are the possessors of 'deep knowledge' or 'secret information'. This implies that you are better than average instead of the reality that you are well BELOW average. So conspiracy theories are a natural way to get validation and group/peer support based on these mutual delusions. It allows you to think you are very intelligent instead of the truth that you are the opposite.
The general evidence to support this hypothesis is that you will notice that all FEers are poorly educated, low IQ and have social inadequacies. The exception to that is otherwise bright and educated people who suffer from sever mental health issues.
People need to feel valued and important. That need is so strong that moving into the arena of delusional behaviour is fairly easy.