I'm not sure of the reasons for the declinations.
My guess is that it had something to do with the fact that the documentarian is a former Democratic speechwriter.
A few years ago AMC did a feature on the movie "Halloween" and its director John Carpenter, to coincide with its annual October horror movie marathon.
The interviewer wanted assurances that Carpenter wasn't part of a right-wing Christian agenda to promote "family values".
How in the world could someone associate "family values" to a slasher movie, much less a right-wing agenda, you ask?
Well it seems that all of the "experienced" girls in the film ended up dead, while the virgin lived. Carpenter was asked if he was trying to teach kids the wacky notion that there are risks to sexual activity at that age.
I didn't hear his response, I was in such disbelief of the question.
Think Mickey Moore On "Documentary". That's why.
Maybe they suspect the agenda of a former Democratic speech writer turned documentary maker.