We're just much better at creating stories ("convoluted logic") than we are understanding our belief-making process.
Dismiss them? The context is: I don't think it is necessary to understand the thought processes of truth deniers [0] to cultivate the "how to think" skill for yourself.
[0] Something that's a 100% true: Square has 4 sides, 0 + 0 = 0, The Hubble Space Telescope is real, etc
The Hubble telescope may be real. I have more reasons to think it exists than to think it doesn't exist, but I wouldn't call the reasons undeniable. I haven't even seen the thing, nor have I touched it. I've only heard people talk about it, seen text written about it, I haven't been to space, nor have I talked to anyone who was involved in building it. I've also heard people say the earth is flat, and seen that written in text too, so evidently, spoken and written accounts alone is not undeniable evidence.