Right, so what most people do when faced with a lack of knowledge is go out looking for it or maintain weakly held beliefs. To conclude that something isn't possible because one doesn't know of it is thought-limiting.

This is the political version of claiming, "I don't know how to sew and I've never seen someone sew. Therefore sewing is impossible." It's stunningly wrong. I can't seriously believe someone would think this way.

> Right, so what most people do when faced with a lack of knowledge is go out looking for it or maintain weakly held beliefs.

Exactly. This is why I've spent the last ten years of my life trying to find a real unicorn in nature. Weakly held beliefs are never good enough for me!

I have never seen someone ridicule the idea that "Absence of evidence is evidence of absence" before, but you do you.