That your post has been downvoted is disheartening. Your reply was factually correct, cited, and reasonably polite.
Perhaps instead of saying "at best" they are con artists, it would have been more polite to say at worst, they are con artists. Probably many earnestly believe in what they are doing, and are just wrong.
To vehemently support the policy of the hour as moral and correct, and then to be later shown to be wrong. At best a fool and at worst a criminal. Is more than many can tolerate. They would rather maintain the lie in the face of all evidence.
It really doesn't matter how earnest they are when polygraphs have been known to be garbage pseudoscience for decades, and especially when people's lives can be derailed by the fraudulent "results" obtained from a polygraph or even just the fiction that it can get results:
"In the United States of America, (where polygraph testing is a growth industry) the admissibility of lie detector test results is determined by courts and legislators on a State by State basis.
In the Federal legal system, test results are inadmissible as substantive evidence. Whilst some States have allowed test results in criminal trials, States such as such as California have prohibited the admission of such evidence unless all parties consent to its admission."
Perhaps instead of saying "at best" they are con artists, it would have been more polite to say at worst, they are con artists. Probably many earnestly believe in what they are doing, and are just wrong.