Why? Because they lack credibility. And they can never ever have credibility without evidence, without concrete indisputable proof to support their theories.
And as long as all they have to show is theories and assumptions they will be easily dismissed and marginalized and in the process they'll make it far easier to marginalize anyone else who can be associated with them because of some of their ideas or beliefs, which especially negatively affects those who are trying to bring to light evidence of a serious issue.
p.s.: it doesn't help their case either that pretty much all of them assume their mere theories must be true just because they are possible and that they attack anyone who questions their rationale or lack thereof
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