Deliberate deception
Paradoxers can be made, as well as born.
Proving that something doesn’t exist is hard, though it can be done. More often, scientists work out more and more restrictions on the characteristics something can have, until the idea has no place left to hide.
A common feature of paradoxers is a confusion between a simple argument and a correct one.
An enormous apparatus for scientific research is finding only what was expected. This bothers scientists.