To me it's kind of a "black and white" thing. These folk often think if it's not one, it's got to be the other.
(If I were to guess, I'd think it might be OCD related - something like a desire for things to line up neatly and be label-able.)
A recent example was the "if gravity holds Earths air down, why isn't it all squashed up more" thread in Q&A. The idea that Earths' gravity was strong enough to hold the air close, but not enough to squash down - didn't seem to occur to the poster. (I'm not making accusations about that poster - it's just arecent example of B&W that struck me.)
A particular ATM poster "learns" one thing "black holes suck in light" and then over-applies it to everything "there's a black hole in each Galaxy - why can we see Galaxies?".
The real Universe is complicated. Real things are grey.
Grey is hard to understand.
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Maybe not so different to the (Moon) HB's.
Similar B&W thinking may help lead to the "stars!" and "Dust on the pads!" type of claims.
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